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100-119
• STATE OF ALASKA • Al ASKA OIL AND GAS CONSERVATION COMMISSION WELL COMPLETION OR RECOMPLETION REPORT AND LOG 1a. Well Status: Oil ❑ Gas ❑ SPLUG ❑ Other ❑ Abandoned ❑✓ - suspended El 20AAC 25.105 20nnc 25.110 GINJ ❑ WINJ ❑ WAGE] WDSPL ❑ No. of Completions: 1b. Well Class: Development ❑ Exploratory Service ❑ Stratigraphic Test Q ❑ 2. Operator Name: Bureau of Land Management 6. Dat mp., Susp., or Aband.: ' 3/15/2018 14. Permit to Drill Number / Sundry: 100-119/ 3. Address: 222 W. 7th Ave., #13, Anchorage, AK 99513 7. Date Spudded: 8/20/1952 15. API Number: 50-119-10010-00-00 4a. Location of Well (Governmental Section): Surface: 3,316' FWL, 4,871' FNL, T1S, R7W, S2, Umiat /vA> 9-3- Lat: 69.3778504919, Long: -153.511401886 Top of Productive Interval: Lat: 69.3778504919, Long: -153.511401886 Total Depth: MAP gs i Lat: 69.3778504919, Long: -153.511401886 &-4( ,/9 ,. 8. Date TD Reached: 11/3/1952 4 °ZG `fig' 16. Well Name and Number: Wolf Creek #3 9. Ref Elevations: KB:� ' GL: '737- BF: 7 5" 17. Field / Pool(s): NPR -Alaska 10. Plug Back Depth MD/TVD: Surface 18. Property Designation: 4b. Location of Well (State Base Plane Coordinates AD 27): Surface: x- 563,418.68 y- 5,622,1 . Zone- 5 TPI: x- 563,418.68 y- 5,622,198.41 Zone- 5 Total Depth: x- 563,418.68 y- 5,622,198.41 Zone- 5 11. Total Depth MD/TVD: • 3,760' 19. DNR Approval Number: N/A 12. SSSV Depth MD/TVD: N/A 20. Thickness of Permafrost MD/TVD 5. Directional or Inclination Survey: Yes (attached) No ❑✓ Submit electronic and printed information per 20 AAC 25.050 13. Water Depth, if Offshore: N/A (ft MSL) 121. Re-drill/Lateral Top Window MD/TVD: I N/A 22. Logs Obtained: List all logs run and, pursuant to AS 31.05.030 and 20 AAC 25.071, submit all electronic data and printed logs within 90 days of completion, suspension, or abandonment, whichever occurs first. Types of logs to be listed include, but are not limited to: mud log, spontaneous potential, gamma ray, caliper, resistivity, porosity, magnetic resonance, dipmeter, formation tester, temperature, cement evaluation, casing collar locator, jewelry, perforation record. Acronyms may be used. Attach a separate page if necessary I N/A Sops JUL 0 2 LI i� JUN 19 2018 and 23. CASING, LINER AND CEMENTING RECORD WT. PER GRADE SETTING DEPTH MD SETTING DEPTH TVD HOLE SIZE CEMENTING RECORD AMOUNT CASING FT TOP BOTTOM TOP BOTTOM PULLED 23-5/8" Unknown Unkno -37' --80' -37' -80, 22" Conductor casing jacket N/A 16" 84 J-55 0 107' 0 107' 22" Cond. cemented to surface 125 sx 10-3/4" 55 N-80 0 625' 0 625' 12-1/4" & 17" IA cemented to surface 210 sx 24. Open to production or injection? Yes ❑ No Q If Yes, list each interval open (MD/TVD of Top and Bottom; Perforation Size and Number; Date Perfd): ^, --.r.'T_� -4,/�S(g V 25. TUBING RECORD SIZE DEPTH SET (MD) PACKER SET (MD VD) 26. ACID, FRACTURE, CEMENT SQUEEZE, ETC. Was hydraulic fracturing used during completion? Yes ❑ N Per 20 AAC 25.283 (i)(2) attach electronic and printed information ❑ DEPTH INTERVAL (MD) AMOUNT AND KIND OF MATERIAL USED 0'-132' MD 16.5 bbls 16.0 ppg Class G Arctic in 10-3/4" csg. 27, PRODUCTION TEST Date First Production: N/A Method of Operation (Flowing, gas lift, etc.): N/A Date of Test: N/A Hours Tested: N/A Production for Test Period Oil -Bbl: N/A Gas -MCF: N/A Water -Bbl: Choke Size: N/A N/A Gas -Oil Rati N/A Flow Tubing Press. Casinq Press: N/A Calculated 24 -Hour Rate Oil -Bbl: N/A Gas -MCF: N/A Water -Bbl: Oil Gravity - API (corr): N/A N/A Form 10-407 Revised 5/2017 CONTINUED ON PAGE 2 RBDMS� JUN 2 0 29Wmit ORIGINIAL only/ P40 Pit 6 -.i s'/ � "g�G z � /A "/& dh 28. CORE DATA • Conventional Core(s): Yes ❑ No Sidewall Cores: Yes ❑ No ❑� If Yes, list formations and intervals cored (MD/TVD, From/To), and summarize lithology and presence of oil, gas or water (submit separate pages with this f)rm, if needed). Submit detailed descriptions, core chips, photographs, and all subsequent laboratory analytical results per 20 AAC 25.071. 29. GEOLOGIC MARKERS (List all formations and markers encountered): 30. FORMATION TESTS NAME MD TVD Well tested? Yes ❑ No ❑✓ If yes, list intervals and formations tested, briefly summarizing test results. Permafrost - Top Permafrost - Base Attach separate pages to this form, if needed, and submit detailed test Top of Productive Interval information, including reports, per 20 AAC 25.071. Formation at total depth: 31. List of Attachments: 3160-5; Olgoonik Construction Services operations summary; photographic report; wellbore schematic; daily reports. Information to be attached includes, but is not limited to: summary of daily operations, wellbore schematic, directional or inclination survey, core analysis, paleontological report, production or well test results, per 20 AAC 25.070. 32. 1 hereby certify that the foregoing is true and correct to the best of my knowledge. Authorized Name: Wayne Svejnoha Contact Name: Jessie Chmielowski Authorized Title: Branch Chief nergy nd inerals Contact Email: jchmielowski@blm.gov Authorized Contact Phone: 907-271-4190 Signature: Date: eP% 711 INSTRUCTIONS Jand General: This the required attachments provide a complete and concise record for each well drilled in Alaska. Submit a well schematic diagram with each 10-407 well completion report and 10-404 well sundry report when the downhole well design is changed. All laboratory analytical reports regarding samples or tests from a well must be submitted to the AOGCC, no matter when the analyses are conducted. Item 1 a: Multiple completion is defined as a well producing from more than one pool with production from each pool completely segregated. Each segregated pool is a completion. Item 1 b: Well Class - Service wells: Gas Injection, Water Injection, Water -Alternating -Gas Injection, Salt Water Disposal, Water Supply for Injection, Observation, or Other. Item 4b: TPI (Top of Producing Interval). Item 9: The Kelly Bushing, Ground Level, and Base Flange elevations in feet above Mean Sea Level. Use same as reference for depth measurements given in other spaces on this form and in any attachments. Item 15: The API number reported to AOGCC must be 14 digits (ex: 50-029-20123-00-00). Item 19: Report the Division of Oil & Gas / Division of Mining Land and Water: Plan of Operations (LO/Region YY -123), Land Use Permit (LAS 12345), and/or Easement (ADL 123456) number. Item 20: Report measured depth and true vertical thickness of permafrost. Provide MD and TVD for the top and base of permafrost in Box 29. Item 22: Review the reporting requirements of 20 AAC 25.071 and, pursuant to AS 31.05.030, submit all electronic data and printed logs within 90 days of completion, suspension, or abandonment, whichever occurs first. Item 23: Attached supplemental records should show the details of any multiple stage cementing and the location of the cementing tool. Item 24: If this well is completed for separate production from more than one interval (multiple completion), so state in item 1, and in item 23 show tl e producing intervals for only the interval reported in item 26. (Submit a separate form for each additional interval to be separately produced, showing the data pertinent to such interval). Item 27: Method of Operation: Flowing, Gas Lift, Rod Pump, Hydraulic Pump, Submersible, Water Injection, Gas Injection, Shut-in, or Other (explai ). Item 28: Provide a listing of intervals cored and the corresponding formations, and a brief description in this box. Pursuant to 20 AAC 25.071, submit detailed descriptions, core chips, photographs, and all subsequent laboratory analytical results, including, but not limited to: porosity, permeability, fluid saturation, fluid composition, fluid fluorescence, vitrinite reflectance, geochemical, or paleontology. Item 30: Provide a listing of intervals tested and the corresponding formation, and a brief summary in this box. Submit detailed test and analytical laboratory information required by 20 AAC 25.071. Item 31: Pursuant to 20 AAC 25.070, attach to this form: well schematic diagram, summary of daily well operations, directional or inclination survey, and other tests as required including, but not limited to: core analysis, paleontological report, production or well test results. Form 10-407 Revised 5/2017 Submit ORIGI AL Only � S r .7.,,N... Olgoonik Construction Services, LLC. 3201 'C' Street, Suite #700 Anchorage, Alaska 99503 April 24th, 2018 Bureau of Land Management (BLM) 222 West 7th Ave. #13 Anchorage, Alaska 99513 RE: Sundry Notice (Permanent Abandonment) Well: Wolf Creek Test Well #3 TRS: 3,316 FWL, 4,871 FNL, T1S, R7W, Section 2, UM Dear Ms. Eagle, Olgoonik Construction Services, LLC. hereby gives Final Abandonment Notice for a Sundry Approval to Permanently Abandon the WC #3 Exploration Well. All work has been completed per the approved conditions of approval as of 3/15/2018. Pertinent information attached to this application includes the following: 1) Form 3160-5 Sundry Application 2) Executive Operations Summary 3) Photographic Report 4) Wellbore Schematic 5) Detailed Daily Operations Reports The following is the OCS designated contact for reporting responsibilities to the BLM: James Nunley General Manager (907) 232-9952 If you have any questions or require further information, please don't hesitate to contact me. Sincerely, Zach Sayers Engineering Manager • • Form 3160-5 UNITED STATES FORM APPROVED OM1? No. 1004-0137 (June 2015) DEPARTMENT OF THE INTERIOR f xpires: January 31,201 S 5. Lease Serial No. NIA .._._ _ BUREAU OF LAND MANAGEMENT SUNDRY NOTICES AND REPORTS ON WELLS 6 If Indian, AllottecorTribe Name Do not use this form for proposals to drill or to re-enter an abandoned well. Use Form 3160-3 (APD) for such proposals. N/A SUBMIT IJV TRIPLICATE - Other instructions on page 2 7. If Unit of CA/Agreement, Name and/or No 1. Type of NVelt NIA S. Well Name and No. Wolf Creek Test Well #3 ❑ Oil 14c11 ❑ Gas well m Other 2. Name of Operator Bureau of Land Management 9. API t4'0l No. 50-119-10010-00-00 3a. Address 222 W 7th Ave, #13 Anchorage, AK 99513 3b. Phone No. (include ama code) to Field and Pool or Exploratory Arca (907) 271-4354 Wolf Creek, NPR -Alaska 4. Location of Well fFoologe Sec, T.R.M. or Sunvi Description) t 1. Country or Parkh, State 3,316' FWL, 4,871' FNL, T1 S, R7W, S2, Umiat / Lit 69.3778504919, Long -153 511401886 North Slope Borough, AK 12 CHECK THE APPROPRIATE BOX(ES) TO INDICATE NATURE OF NOTICE, REPORT OR OTI II.. R DATA TYPE OF SUBMISSION TYPE OFACTION Notice or Intcat ❑ Aeidize ❑ DLepen ❑ Production (Start/Resume) ❑ Water Shut -Off ❑ Alter Casing ❑ Hydraulic Fracturing ❑ Acclamation ❑ Well Integrity © Subsequent Report ❑ Casing Repair ❑ New Construction ❑ Rec:omplele ❑ Other ❑ Change Plans © Plug and Abandon Temporarily Abandon Final Abandonment Notice I ❑ Convert to Injection ❑ Plug Back ❑ Watcr Disposal 13. Describe, Proposed or Completed Operation: Clearly state all pertimni details, including estimated starting date of any proposed wort: and approximate duration thereof If the proposal is to deepen directionally or recomplete horizontally, give subsurface locations and measured and true vertical depths of all pertinent markers and zones. Attach the Bond tinder which the work will be perfonned or provide the Bond No on rale with BLM/BIA Required subsequent reports must be filed within 30 da,,s following completion of the involved operations. If the operation results in a multiple completion or recompletaon in a new interval, a Form 31604 must be filed once testing has been completed Final Abandonment Notices must be filed only after all requirements, including reclamation, have been comp'.cted and the operator has determined that the site is ready for final inspection) Notice of Final Completion of Well Abandonment and Surface Remedlation Activities Plugging Operations began 3/11/2018 and were completed 3/15/2018 Please see attached reports for in depth details. The IA was plugged with a cement plug to surface and tested to 500 psi compressive strength. The IA was cemented from 114' to surface (GL measurement) The existing using at surface was cut off during the BOP rig up. A marker plate was welded on 5' below ground level, 35 cu yards of soil was removed from WC#3 around the wellhead and cellar and 24 cu yards of fresh clean fill were replaced 14 1 hereby certify that the foregoing is true and correct. Name (Prinred/7iped) Zach Sayers Title Engineering Manager Signature ;C. , Date 04/24/2018 /""PACE FOR FEDERAL OR STATE ONCE USE A v by `-'" Branch %k. Ener and Minerals Date --- ---- ---- -- ----- - _.---------- C rtify trnS plical, irony, err a: . App. "this rights docs not warrent sor e certify tlt the pphcant holds le or itable tale to thou rights in the subject lease Office n which wot title the applicant to duct operations thereon. /� J Title 18 U.S.0 Section 1001 and Titic 43 U,S.0 Section 1212, make it a crime for any person knowingly and willfully to make to any depurtmentror ngimcy ofthe United States any false, factitious or fraudulent statements or representahons as to any matter within its jurisdiction. (Instructions on page 2) From: Zach Sayers Date: April 24th, 20. i + • 0 RE: Wolf Creek Test Well #3 Executive Summary • ' 0 Well Background Wolf Creek Test Well #3 was drilled by the U.S. Navy in 1951. Summer site inspection was performed in August'17 finding an ice plug at 24' MD. This well was drilled to a TD of 3,760' MD with the 16" ID casing set to 107' MD. 10-3/4" casing is set to 625' MD. A few gas shows were noted in the formation testing from 1,500' to 2,100. MD. Two cement bridge plugs were set with the top plug at 554' MD. Oil Based drilling mud was left in the wellbore. Operations Summary: OCS began the rig up on location on 03/11/2018. A snow pad was built to level the wellsite and provide a working area for the well equipment. A cellar was dug using the excavator and a frost bucket. All well equipment was spotted into place to include a cement unit, steam boiler, fresh water car, tool conex, hose conex, pit, and the Boart Longyear LX10 rig. The existing casing stump was cut below ground level, dressed and a starting flange was welded on to ' allow safety control and closed loop fluid containment for the plugging operations. Upon inspection, wooden timbers were found inside of the existing 10-3/4" casing. The wood was frozen into the wellbore and could not be removed. Blow Out Prevention Equipment (BOPE) was rigged up, then the rig was skid over the well center. A riser and flow pan were lowered through the rig floor and nippled up onto the wellhead. A BOP function test was performed prior to commencing operations. Thawing operation commenced on 3/12/18. Thawing operations were slowed while dealing with the existing wood timbers inside of the casing. A spear point was made on the bottom of the workstring and the workstring was thrusted into the wood pieces repeatedly to break the timbers into pieces that were circulated to surface. The wood had to be removed in this fashion to a depth of 132' MD. On 3/13/18 cement was pumped from 114' below ground level to surface inside the 10-3/4" IA. The workstring was pulled out of hole and laid down. The remaining wellhead and stub of 10-3/4" casing were cut off and capped with an API marker plate 5' below ground level. The surface equipment was rigged down and removed from location. The well cellar area was back filled with fresh fill and all surface debris was cleaned from location. Operations were completed on 3/15/2018. Sincerely, Zach Sayer Engineering Manage Location Of Well • Cardinal No. 2 Rotary Rig Government Section: 3,316 FWL, 4,871 FNL, T1S, R7W, S2 Umiat Meridian Spud: August 20th, 1952 State Plane Coordinates: X: 563,418.68 Y. 5,622,198.41 Zone 5 (NAD27) Completed: November 3'd, 1952 Latitude/Longitude: 69°22'40.2618"N/153°3041.0468"W (NAD 83) 18' MD/TVD KiiOinal Ground Leve).................................................. ---------- ----------------------- 5' Below Ground Level i 2, 22" OH to 119' MD / TVD *22" reamer ran to 119' 17" OH to 121' MD / TVD * 17" reamer ran after struggling to get csg to TD Drilling fluid left in wellbore below cement plug 12.43 ppg OBM left in hole (11/03/1952) Expected to be a 70/30% emulsion based system Cement spotted from 554'— 621' MD /TVD (67') 30 sx cmt 12-1/4" OH to 652' MD/TVD Cement spotted from 1,447'— 1,735' MD /TVD (288') 120 sx cmt 9-7/8" OH f/ 652' MD t/ 3,740' MD/TVD 7-1/2" OH f/ 3.740' MD 760'M Marking Plate welded on with 1/8" weep hole -------------------------- Conductor Casing Jacket �- 43' of 23-5/8"CSG (on middle two joints of the conductor) " Conductor Casing 16"ID CSG to 107' MD/TVD 4 jts ran for a total of 86' *Assumed 16", 84#, J-55 *(15.01" ID, 14.822" Drift, 2,980 Burst, 1,410 Collapse)* Cemented with 125 sx of Cal -Seal (Poured) Expected TOC surface P&A Cement Plug Cement circulated up IA 132' MD — Ground Level 16.5 bbls total cement pumped (returns taken to surl ace) 100 sx Class 'G' Artic Grade cmt 0.93 ft3/sk yield, 16.0 ppg Surface Casing 10-3/4", 55#, N-80 CSG to 625' MD/TVD (9.76" ID, 9.604" Drift, 6,450 Burst, 4,020 Collapse) Cemented with 210 sx of High Early cmt Expected TOC surface Wolf Creek Test Well #3 As -Plugged Schematic TD: 3,760'MD/TVD Wolf Creek Exploration Area 01Qonik /'� g PBTD: Surface NPRA, Alaska Drawn By: Construction Date API # 50-119-10010 PTD # 100-1190 vs Services u.c 1& 4/24/2018 Elevation KB: 750' RKB — GL: 18' WC #3 DOR Daily Operations Report Well Name: Wolf Creek Test Well #3 Operator: ELM Report #: 1 Well Type: Oil & Gas Exploration Well Apl #: 50-119-10010-00-00 Report Date: Field: NPR -Alaska PTD #: 100-1190 Contract#: L16PC00005 Contacts Weather Supervisor: Shane Phone #: 801-556-0946 Gen. Conditions: Calm McGeehan Site Manager: lames Nunley Phone #: 907-232-9952 Phase: Proj Eng: Zach Sayers Phone #: 281-615-1408 Wind Direction: East BUM PI: Amanda Eagle Phone #: Wind Gusts (mph): 0-10 MPH Temp. (Low, High): 4 20 Well Status TD: 3,760 GL, ft: 732 Planned Days: 3 PBTD: 554 RKBA: 18 Start Date: 11-Mar-18— 1 Mar-18Fluid Fluidin Well: 12.43# OEM OH ID, in: 12-1/4" Operation Days: 1 Last BOP Test: Last Safety Mtg: 3/11/2018 Last Evac Drill: Csg String OD (in) Depth (ft) Weight (#/ft) Integrity Issues Outer Most: Conductor: 16" 107 54 Surface: 103/4" 625 55 Production: Pump Parameters Pump # Type Model Rate (BPM) Pressure (psi) Triplex Mud Pump Wll Mud / Brine Properties Fluid Type Weight (ppg) Volume (bbls.) RillCumulative Volume (bbls): 0 Waste Fluids Fluid Type Weight (ppg) Daily Volume (bbls.) Brine -Added to ISO Tank #1 CLASS 1: Cement Rinsate CLASS II: Cement Returns ,;.. Cumulative Volume (bbls): 0.00 Operations Report 24 Hour Mobilize Equipment to WC#3, MIRU Summary: 24 Hour Test BOPS, Thaw down to target depth. Forecast: HSE Summary: No Accidents, 1 Incidents, No Spills. Fire in the Tool Conex. Conex removed from location. No harm to personnel or environment. From TO .Hours Operational Details (6:00- 6:00) - Arrive at WC#1 wellsite. Find Tool conex smoking. Hook up chains to Conex and pull away from wellsite with excavator. 6:00 8:30 2:30 Mob to WC#3. 8:30 12:30 4:00 Continue to dig Cellar. Weld on starting head. NU BOPS. SIMOPS: Move equipment from Wolf Creek #1 to Wolf Creek #3. 12:30 13:00 0:30 Break for lunch 13:00 14:30 1:30 Skid Rig over cellar, raise mast. Continue to mobilize equipment to WC#3. , 14:30 18:30 4:00 Spot Boiler, Take on fresh water to boiler and rig. Spot Heaters, Spot Cement Unit, Top of all fuel. Total Hours: 12:30 Remarks: WC #3 DOR WC#3 DOR Daily Operations Report 0 Well Name: Wolf Creek Test Well #3 l0perator: ELM I Report #: 2 Well Type: Oil & Gas Exploration Well JAPI #: 5 0-119-10010-00-0 0 Report Date: 12 -Mar -18 Field: NPR -Alaska PTD #: 100-1190 Contract #: I L16PC00005 Contacts Weather Supervisor: Shane Phone #: McGeehan 801-556-0946 Gen. Conditions: Calm Site Manager: James Nunley Phone#: _ 907-232-9952_ Phase: Frei Eng: Zach Sayers Phone #: 281-615-1408 Wind Direction: East ELM PI: Amanda Eagle Phone #: Wind Gusts (mph): 0-10 MPH Temp. (Low, High): -8 110 Well Status TD: 3,760 GL, ft: 732 Planned Days: 3 PBTD: 554 RKB, it: 18 Start Date: 11 -Mar -18 Fluid in Well: 12.43# OBM ON ID, in: 12-1/4" 10peration Days: 2 Last BOP Test: 3/12/2018 Last Safety Mtg: 3/12/2018 1 Last Evac Drill: _ 3/12/2018 Csg String oD (in) Depth [ft) Weight (#/ft) Integrity Issues Outer Most: Conductor: 16" 107 54 Surface: 30-3/4" 625 55 Production: Pump Parameters , Pump # Type Model Rate (BPM) Pressure (psi) Triplex Mud Pump Wil 0.5 - 1.0 0-25 Mud / Brine Properties Fluid TypeWeight (ppg) Volume (bbls.) NaCl Brine 9.7 26 Cumulative Volume (bbls): 26 Waste Fluids Fluid Type Weight (ppg) Daily Volume (bills.) Brine - Added to ISO Tank #1 CLASS I: Cement Rinsate CLASS II: Cement Returns Cumulative Volume (bbls): 0.00 Operations Report 24 Hour Mcbilde Equipment to WC#3, MIRU, Test BOPS, Thaw down to target depth. Summary: 24 Hour Cement wellbore to surface. RD Equipment. Forecast: HSE Summary: No Accidents, No Incidents, No Spills. .From To Hours Operational Details (6:00- 6:0(1) Fuel Equipment 7:00 9:30 2:30 MU Hardline Take on fresh water to cement unit. Cut NaCl salt and batch mix brine to 9.71 A total of 25 bbls were mixed. 9:30 11:30 2:00 11:30 12:00 0:30 Break for lunch 12:00 14:30 2:30 Attempt BOP test. Leak At weld. Drain Stack. Be- Weld Staring Head to casing. Complete BOP test. Close lower pipe ram on 1-1/4" test joint. 25 turns to close. Pressure up to 400 psi (200 psi min planned). Hold for 5 minutes and inspect for leaks. 14:30 14:45 0:15 No leaks. Relief Pressure, Open Rams. Test witnessed by FILM Representative: Rod Brashear Take on Brine to Rig Pits. (14 bbls) 14:45 15:00 0:15 Brine at 120' F, 9.7#, NaCl Brine. MU Joint#1 15:00 15:19 0:19 RIH with it IF 1 while circulating hot brine. (15.0'-25.43' MD) 1.0 bpm, 0-25 psi, 130'F In - 907 Out. RIH with It IF 2 while circulating hot brine. (25.43'- 36.04' MD) 1.0 bpm, 0-25 psi, 131 In -105'F Out. 15:19 16:21 1:02 Ex troubles with wood / timbers left in the hole. Spearing timbers with mule shoe to break u Pullin large periencing pe g p. g g wood chunks from flow pan. RIH with Jt # 3 while circulating hot brine. (36.04' - 46.76' MD) 1.0 bpm, 0-25 psi, 120'F In - 90'F Out. 16:21 17:00 0:39 Experiencing troubles with wood / timbers left in the hole. Spearing timbers with mule shoe to break up. Pulling large wood chunks from flow pan. RIH with it IF 4 while circulating hot brine. (46.76' - 57.46' MD) 1.0 bpm, 0-25 psi, 135'F In -1037 Out. 17:00 17:38 0:38 Experiencing troubles with wood / timbers left in the hole. Spearing timbers with mule shoe to break up. Pulling large wood chunks from flow pan. RIH with Jt # 5 while circulating hot brine. (57.46' - 68.16' MD) 17:38 18:13 0:35 1.0 bpm, 0-25 psi, 135'F In - 30S"F Out. Pulling large wood chunks from flow pan. Returns oily and green. RIH with A # 6 while circulating hot brine. (68.16'-78.73' MD) 18:13 18:49 0:36 1.0 bpm, 0-25 psi, 136'F In - 3057 Out. Pulling large wood chunks from flow pan. Returns oily and green. RIH with Jt # 7 while circulating hot brine. (78.73' -89.30' MD) 1.0 bpm, 0.25 psi, 135'F In - 1057 Out. 18:49 19:21 0:32 Pulling large wood chunks from flow pan. Returns oily and black. Chunky like tar. large chunks of wood appear to be a 4" x 8" x 4' Timber RIH with Jt # 8 while circulating hot brine. (89.30' - 99.86' MD) 19:21 20:04 0:43 1.0 bpm, 0-25 psi, 130°F In - 1007 Out. Small slivers of wood observed in returns. Returns oily and black. Chunky like tar. RIH with A # 9 while circulating hot brine. (99.86'- 110.58' MD) 20:04 20:35 0:31 1.0 bpm, 0-25 psi, 1307 In - 1007 Out. Small slivers of wood observed in returns. Returns oily and black. Chunky like tar. RIH.with it # 10 while circulating hot brine. (110.58' - 121.31' MD) 20:35 21:30 0:55 1.0 bpm, 0-25 psi, 1447 In - 105"F Out. Small slivers of wood observed in returns. Returns oily and green again. Some chunks. RIH with Jt# 11 while circulating hot brine. (121.31'-132.06'MD) 21:30 22:00 0:30 1.0 bpm, 0-25 psi, 1407 In - 115'F Out. Returns oily and green. Some chunks. 22:00 22:15 0:15 lCBU. 1.0 bpm, 0 psi, 1257 In - 1i Out. 22:15 22:25 111:35 0:10 lPOOH.LD Workstring sideways. 22:25 22:35 0:10 Secure wellbore for evening. Total Hours: Remarks: WC#3 DOR WC #3 DOR Daily Operations Report • Well Name: Wolf Creek Test Well #3 Operator: BLM Report #: 3 Well Type: Oil & Gas Exploration Well JAPI #: 50-119-10010-00-00 1 Report Date: 13-Mar-18 Field: NPR-Alaska PTD #: 100-1190 Contract #: L16PC00005 Contacts Weather Supervisor: share Phone #: 801-556-0946 Gen. Conditions: Calm McGeehan Site Manager: James Nunley Phone #: 907-232-9952 Phase: - Proj Eng: Zach Sayers Phone #: 281-615-1408 Wind Direction: East _ BLM PI: Amanda Eagle Phone #: Wind Gusts (mph): 0_10 MPH - Temp.(Low, High): -2 12 Well Status TD: 3,760 GL, ft: 732 Planned Days: 3 PBTD: Surface RKB,ft: 18 Start Date: 11-Mar-18 Fluid in Well: 16.0# Cement OH ID, in: 12-1/4" Operation Days: 3 Last BOP Test: 3/12/2018 Last Safety Mtg: 3/13/2018 Last Evac Drill: 3/12/2018 Csg String 'OD (in) Depth (ft) Weight (#/ft) Integrity Issues Outer Most: Conductor: 16" 107 54 Surface: 10-3/4" 625 55 Production: Pump Parameters Pump # Type Model Rate (BPM) Pressure (psi) Triplex Mud Pump Wil 0.5 - 1A 0-25 Mud / Brine Properties Fluid Type Weight (ppg) Volume (bbls.) NaCl Brine / OBM Mix 10.1 18 .......... . Cumulative Volume (bbls): 18 Waste Fluids Fluid Type Weight (ppg) Daily Volume (bbls.) Brine / OBM Mix-Added to ISO Tank #1 CLASS I: Cement Rinsate CLASS II: Cement Returns s Cumulative Volume (bbls): 0.00 Operations Report 24 Hour Cement wellbore to surface. RD Equipment. Summary: 24 Hour Complete NO, Test cement, RDMO Forecast: HSE Summary: No Accidents, No Incidents, No Spills. .From To Hours Operational Details (6:00 - 6:00) 7:00 7:30 0:30 Fuel Equipment 7:30 8:00 0:30 Startup Equipment, Lubricate Rig 8:00 8:30 0:30 Open BOP, sniff for gas. Clear Reading. 8:30 8:45 0:15 TIH from surface to 132' MO. Set end of workstring 4' above hole bottom. Circulate hole. 1.0 BPM, 0 psi, 66°F In - 64°F Out. 8:45 9:30 0:45 SIMOPS: Prepare for cement job. Transfer Dirty, Oily Brine Mix from active to ISO Tank #1 (Green). Repair Boiler (Starter Relay). Prepare for cement job. SIMOPS: Circulate while preparing for cementjob. 9:30 10:30 1:00 1.0 BPM, 0 psi, 65°F In - 65°F Out. SIMOPS: Transfer Dirty, Oily Brine Mix from active to ISO Tank #1 (Green). 10:30 10:45 0:15 PJSM on cement job Close BOPS (lower rams on 1-1/4" workstring) 10:45 11:25 0:40 Continue circulating 1.0 BPM, 0 psi, 65°F In - 65°F Out. Perform cement abandonment in the 10-3/4" casing 132' MD to surface. Take on 8.0 bbls of fresh water, add 5 gal of retarder and 2 gal defoamer. Wet yield 0.93 ft3/sk, mix water 3.556 gal/sk Batch mix 100 sacks of ArticSet I Class'G' cement and mix to 16.0+ ppg. Begin Batch Mixing at 11:03 AM. 11:25 12:05 0:40 Pumped 16.5 bbls of 16.0+ ppg cement down 1-1/4" workstring taking returns up the IA at 1.0 bpm, 0-30 psi. Cement returns noted after 9 bbls away. Cement returns weighed 15.9ppg Cement in place at 12:04 PM on 3/13/18. Break Down Cement Lines and Equipment. 12:05 13:00 0:55 Flush BOPS - Break down Fluid Ends of Pumps and flush rinsate. 13:00 13:30 0:30 Break for lunch Lower rig mast, Close rig slide outs, prepare for mobilization 13:30 16:00 2:30 SIMOPS: Prepare and clean cement unit Continue to RD wellsite. Break down hoses, hardline, and transfer fluids. 16:00 18:30 2:30 Total Hours: 11:30 .,... s:. '.--:.... .. .. ,...:. .: . ; .......t .. 44,. ..;.;.;?... Remarks: WC #3 DOR WC #3 DOR Daily Operations Report • Well Name: Wolf Creek Test Well #3 Operator: BLM Report #: 4 Well Type: Oil & Gas Exploration Well JAPI #: 50-119-10010-00-00 Report Date: 14 -Mar -18 Field: NPR -Alaska PTD #: 100-1190 Contract #: L16PC00005 Contacts Weather Supervisor: Shane Phone #: 801-556-0946 Gen. Conditions: Calm McGeehan Site Manager: lames Nunley Phone 9: 907-232-9952 Phase: Proj Eng: Zach Sayers Phone #: 281-615-1408 Wind Direction: East BUM PI: Amanda Eagle Phone #: _ Wind Gusts (mph): 0-15 MPH Temp. (Low, High): -8 5 Well Status TO: 3,760 GL, ft: 732 lPlanned Days: 3 PBTD: Surface RKB,ft: 18 Start Date: 11 -Mar -18 Fluid in Well: 16.0# Cement OH ID, in: 12-1/4" Operation Days: 4 Last BOP Test: 3/12/2018 Last Safety Mtg: 3/14/2018 Last Evac Drill: 3/12/2018 Csg String OD (in) Depth (ft) Weight (#/ft) Integrity Issues Outer Most: Conductor: 16" 107 54 Surface: 10-3/4" 625 55 Production: Pump Parameters Pump # Type Model Rate (BPM) Pressure (psi) Triplex Mud Pump W11 0.5 - 1.0 0-25 Mud / Brine Properties Fluid Type Weight (ppg) Volume (bbls.) NaCl Brine / OBM Mix 10.1 18 Cumulative Volume (bbls): 18 Waste Fluids Fluid Type Weight (ppg) Daily Volume (bbls.) Brine / OBM Mix - Added to ISO Tank #1 35.00 CLASS I: Cement Rinsate 6.83 CLASS II: Cement Returns 4.10 ... Cumulative Volume (bbls): 45.93 Operations Report 24 Hour Complete ND, RDMO, Cutoff casing Summary: 24 Hour Weld on capping plate, burry well. Forecast: HSE Summary: No Accidents, No Incidents, No Spills. From To Hours - Operational Details (6:00 - 6:00) 7:00 7:30 0:30 Fuel Equipment Clean OBM out of Rig Pits 7:30 10:30 3:00 SIMOPS: Mobilize Equipment from WC#3 to WC#1. Mob Fuel Sled, Water Hauler, ISO Tank #1, Heater. Excavate cellar around well. Having issues with metal pylons in cellar area break teeth and bucket shanks. 10:30 11:30 1:00 SIMOPS: Mobilize Cement Unit. 11:30 12:00 0:30 Break For Lunch Excavate cellar around well. Having issues with metal pylons in cellar area break teeth and bucket shanks. 12:00 13:00 1:00 SIMOPS: Lower mast on rig, Pull in slide outs. Mobilize Equipment from WC#3 to WC#1. 13:00 15:30 2:30 Mob Rig, additional heater, Cement Unit. 15:30 17:00 1:30 Work on WC#1 RU. Cutoff WC#3 conductor casing jacket (23-5/8"). Burlap Sack Cement Packer found "'3.5' below ground level. Remove cement plug around conductor casing jacket. 17:00 18:30 1:30 Cut 16" conductor casing. Excellent cement job found between 16" and 10-3/4" annulus. Cutoff 10-3/4" surface casing 5' BGL. Cement found 1' below casing cutoff. Fill with cement to surface. Total Hours: 11:30 ...:....... Remarks: WC #3 DOR WC #3 DOR Daily Operations Report 0 Well Name: Well Type: Wolf Creek Test Well #3 Operator: Oil & Gas Exploration Well API If: BLMReport #: 50-119-10010-00-00 Report Date: 5 15-Mar-18 Field: NPR-Alaska PTD #: 100-1190 Contract #: --- L16P000005 Contacts Weather Supervisor: Shane Phone #: 801-556-0946 McGeehan Gen. Conditions: Calm Site Manager: James Nunley Phone #: 907-232-9952 Phase: - Proj Eng: Zach Sayers Phone #: 281-615-1408 1WInd Direction: East BLM PI: Amanda Eagle Phone #: Wind Gusts (mph): 0-20 MPH Temp. (Low, High): -3 8 Well Status TD: 3,760 GL, ft: 732 Planned Days: 3 PBTD: Surface RKS,ft: SS Start Date: 11-Mar-18 Fluid in Well: 16.0# Cement OH ID, in: 12-1/4" Operation Days: 4 Last BOP Test: 3/12/2018 Last Safety Mtg: 3/15/2018 Last Evac Drill: 3/12/2018 Csg String OD (in) Depth (ft) < Weight (#/ft) Integrity Issues Outer Most: Conductor: Surface: Production: 16" 107 54 10-3/4" 625 55 Pump Parameters Pump # Type Model Rate (BPM) Pressure (psi) Triplex Mud Pump W11 0.5 - 1.0 0-25 Mud / Brine Properties Fluid Type Weight (ppg) Volume (bbls.) NaCl Brine / OBM Mix 10.1 18 Cumulative Volume (bbls): 18 Waste Fluids Fluid Type Weight (ppg) Daily Volume (bbls.) Brine / OBM Mix - Added to ISO Tank #1 CLASS l: Cement Rinsate 35.00 6.83 4.10 CLASS II: Cement Returns ;,....,,, ,..ON Cumulative Volume (bbls): 45.93 Operations Report 24 Hour Summary: Weld on capping plate, burry well. 24 Hour Forecast: Final Report HSE Summary: No Accidents, No Incidents, No Spills. From To Hours Operational Details (6:00 - 6:00) 7:00 19:00 12:00 Well work on WC#1. 19:00 Inspect 30-3/4" casing cementjob. Complete 500 psi compressive strength test. Passed. 21:00 2:00 Compressive strength test observed by BLM representative Rod Brashear. Weld on marker plate leaving weep hole. 21:00 23:00 2:00 Backfill Well with excavator Total Hours: 16:00 Remarks: WC #3 DOR 0 C] AOGCC Coordinate Conversion Check 26 June 2018 INPUT OUTPUT State Plane, NAD27 Geographic, NAD83 5005 -Alaska 5, U.S. Feet Accuracies of conversions from NAD 27 to NAD 83 are typically 12 to 18 cm. Wolf Creek 3 1/1 Northing/Y: 5622198 Latitude: 69.377849355 Easting/X: 563419 Longitude: 153. 5113 9 9427 Convergence: 0 27 36.43849 Scale Factor: 0.999904570 Datum Shift (m.): Delta Lat. = -45.714, Delta Lon = 118.751 Remark: Corpscon v6.0.1, U.S. Army Corps of Engineers lob, NAD 27 State Plane AK Zone 5 Easting Northing 563,868.05 5,622,337.54 564,475.58 5,629,559.99 563,418.68 5,622,198.41 431,521.71 5,636,962.40 592,276.39 5,686,608.03 Wolf Creek #4 711.6 1 3326 1 3435 1 1954 1 1845 Sec 9, T1S, R6W 584,114 1 5,618,548 • • NAD 83 (Decimal Degrees) NAD 83 (Degrees. Minutes Seconds) NAD 83 State Plane AK Zone 5 Elevation Public Land Survey System (PLSS) Legal Description - Umiat Meridian Well N Latitude W Longitude N. Latitude W Longitude. Northing. Easting (NAVD88). FWL FNL FWL FNL (township, range, section) Wolf Creek #1 69.3782208109 -153.507909785 69°22'41.5949" -153'30'28.4752" 5,622,057.689 1,703,893.602 669.5 3,766.21 4,734.94 1,513.79 545.06 T15 R7W 525E Wolf Creek #2 69.3979424615 -153.502746140 69°23'52.5929" -153"30'09.8861" 5,629,280.086 1,704,501.045 401.7 2,157.90 2,797.50 3,122.10 2,482.50 TIN R7W S36SW Wolf Creek #3 69.3778504919 -153.511401886 69°22'40.2618" -153°30'41.0468" 5,621,918.565 1,703,444.230 691.3 3,315.61 4,870.99 1,964.39 409.01 TIS R7W S2SE Titaluk#1 69.4180608533 -154.534897576 69`25'05.0191" -154.32'05.6313" 5,636,683.172 1,571,545.339 846.8 1,094.51 708.32 4,185.49 4,571.68 TIN R11W S26NW Square Lake #1 69.5530648998 -153.281853400 69`33'11.0336" -153"16'54.6722" 5,686,327.625 1,732,301.634 361.4 4,287.28 4,104.37 992.72 1,175.63 T2 R6W S2SE NAD 27 State Plane AK Zone 5 Easting Northing 563,868.05 5,622,337.54 564,475.58 5,629,559.99 563,418.68 5,622,198.41 431,521.71 5,636,962.40 592,276.39 5,686,608.03 Wolf Creek #4 711.6 1 3326 1 3435 1 1954 1 1845 Sec 9, T1S, R6W 584,114 1 5,618,548 • • • • • FORM APPROVED Form 3160-5 UNITED STATES OMB No.1004-0137 (June 2015) DEPARTMENT OF THE INTERIOR Expires:January 31,2018 BUREAU OF LAND MANAGEMENT 5.Lease Serial No. N/A SUNDRY NOTICES AND REPORTS ON WELLS 6.If Indian,Allottee or Tribe Name Do not use this form for proposals to drill or to re-enter an abandoned well.Use Form 3160-3(APD)for such proposals. N/A SUBMIT IN TRIPLICATE-Other instructions on page 2 7.If Unit of CA/Agreement,Name and/or No. 1.Type of Well WA ❑Oil Well 0 Gas Well m Other 8.Well Name and No.Wolf Creek Test Well#3 2.Name of Operator Bureau of Land Management 9.API Well No.50-11940010-00-00 3a.Address 222 W 7th Ave,#13 Anchorage,AK 99513 3b.Phone No.(include area code) 10.Field and Pool or Exploratory Area (907)271-4354 Wolf Creek,NPR-Alaska 4.Location of Well(Footage,Sec.,T,R,M.,or Survey Description) 11.Country or Parish,State 3,316'FWL,4,871'FNL,Ti S,R7W,S2,Umiat /Lat:69.3778504919,Long:-153.511401886 North Slope Borough,AK 12.CHECK THE APPROPRIATE BOX(ES)TO INDICATE NATURE OF NOTICE,REPORT OR OTHER DATA TYPE OF SUBMISSION TYPE OF ACTION ©Notice of Intent ❑Acidize ❑Deepen ❑Production(Start/Resume) ❑Water Shut-Off 0 Alter Casing p Hydraulic Fracturing ❑Reclamation ❑Well Integrity El Subsequent Report ❑Casing Repair ❑New Construction ❑Recomplete ❑Other ❑Change Plans ©Plug and Abandon ❑Temporarily Abandon ❑Final Abandonment Notice ❑Convert to Injection ❑Plug Back ❑Water Disposal 13. Describe Proposed or Completed Operation:Clearly state all pertinent details,including estimated starting date of any proposed work and approximate duration thereof.If the proposal is to deepen directionally or recomplete horizontally,give subsurface locations and measured and true vertical depths of all pertinent markers and zones.Attach the Bond under which the work will be perfonned or provide the Bond No.on file with BLMBIA.Required subsequent reports must be filed within 30 days following completion of the involved operations.If the operation results in a multiple completion or recompletion in a new interval,a Form 3160-4 must be filed once testing has been completed.Final Abandonment Notices must be filed only after all requirements,including reclamation,have been completed and the operator has detennined that the site is ready for final inspection.) Plug and Abandon the wellbore. Please see the attached procedures. p7-t) foo - ItA10,01 431-1 ofr I, ��to �� 2 3L .1 14.I hereby certify that the foregoing is true and correct. Name(Printed/7yped) Zach Sayers Engineering Manager Title Signature r. ,. Date 10/19/2017 / ' SPACE FOR FEDERAL OR STATE OFICE USE Approved by Actr&&C Eru6Qay • Title ZRANC14 CH 1 Er Date I t/z/17 Conditions of approval,if , e attached.Approval of this notice does not warrant or certify that the applicant holds legal or equitable title to those rights in the subject lease office which would entitle the applicant to conduct operations thereon. Title 18 U.S.0 Section 1001 and Title 43 U.S.0 Section 1212,make it a crime for any person knowingly and willfully to make to any department or agency of the United States any false,fictitious or fraudulent statements or representations as to any matter within its jurisdiction. (Instructions on page 2) • • Olgoonik Construction ''tea Services LLc Plug and Abandonment Operations Program Wolf Creek Test Well #3 Wolf Creek Legacy Wells Remediation NPRA, Alaska October 2017 Prepared By: Zach Sayers, OCS Olgoonik Construction Services, LLC 3201 C Street,Suite 700 Anchorage,Alaska 99503 VERSION HISTORY Version Implemented Revision Approved Approval Reason # By Date By Date 1.0 Zach Sayers 10/19/17 /11___._:1,r•___ _.._S _._ r__..!___ • • Plug&Abandonment Plan 4lgoonik Construction BLM-NPRA Legacy Well Remediation Services tic L17PD00146/MOD 1—Wolf Creek Cluster Table of Contents 1 General P&A Design 3 2 Equipment& Supplies 3 3 P&A Procedures 5 3.1 Wolf Creek#3 5 Table of Figures Figure 1: Alternative Diverter Diagram 4 Figure 2: WC#3 Current Completion Schematic 8 Figure 3: WC#3 Proposed Plugging Schematic 9 Figure 4: WC#3 Annuli Diagram 10 Olgoonik Construction Services I General P&A Design 2 • • Plug&Abandonment Plan Olgoonik Construction BLM-NPRA Legacy Well Remediation Services LLC L17PD00146/MOD 1—Wolf Creek Cluster 1 General P&A Design The primary goal is to leave these wells abandoned as per the task order specifications and requirements while reducing the amount of waste generated.The following assumptions will be used for each wellbore in the Task Order: • All P&A procedures will be agreed upon and in accordance with BLM regulations prior to execution. • Forty-Eight hours prior to P&A operations commence, BLM representatives will be notified. 2 Equipment & Supplies OCS and its team will provide the following well specific equipment: • Boart Longyear LX10 Multi-Purpose Drilling Rig o 197hp multi-purpose drill rig o Dressed to handle 3/4", 1-1/4", and 2-7/8" work strings o Standard Workstring: 2-7/8"w/external upset tool joints • Well Control Equipment: o 7-1/16" 3M Double Gate Manual BOP Ram • Upper Ram: 2-7/8" Pipe Ram • Lower Ram: 1-1/4" Pipe Ram o 7-1/16"3M flow Cross • Portable Cementing Equipment Including o 28bb1 Cement batch mixing unit o Triplex Pump used for cement • Storage Tanks o 200 bbl (8,400 Gallons)of storage tank capacity to contain circulated well fluids. o 24 bbl Rig Tank/Mixing Pit o Waste/Slop Tank • Plug and Abandonment Marker o Each well shall be sealed with a metal %"thick metal plate,welded in place with well information inscribed on the plate. Each plate will have a weep hole and be sized for each casing. • Transfer pump,with Backup Pump, Heaters, Pipe, hoses,valves,fittings • Vacuum Unit • Boiler Unit • Track Loader • Excavator Olgoonik Construction Services ( General P&A Design Olgoonik 0 • Plug&Abandonment Plan Construction BLM-NPRA Legacy Well Remediation Services L_c L17PD00146/MOD 1—Wolf Creek Cluster !C ¢ 1� = • 8'e} +WAS», - Choke fat. f ,wOrnererLine(141U f lt1eL ���✓✓✓✓✓i ie so on -.� .i 4 1 Drip Pan . 1 Drip Pan 1 1 _-7-1416'Pitche-Nipple Assembly,...1 I . a A . . ,.....,_Jr-4 ., . ., t i 1 1 4 i r a . i 2-1/15"15.000pzi to Torque Valve: i 'e . '. a' .' Kill) 6 Choke --- M -4 - i „ . RBI/. DESCRIPTION DATE 51 :ALAN e=. A ORIGINAL DPAASING 2.122/17 7_15 ZACH SAYERS Olgoonik -lw S Update to fu bore P:cher Nipple 4/21117 735 4k=e L<oriwlrl;4114x1 SerVices LLC C Update DSA 5A/9/2017 Zis 10/19:2017 D Update to 7-1,116'BOP 5727.%2017 Z15 Citi€EEo Ex v1TU E Gere-al Update: 5107/2017 Z15 FEW di emaiee Di4e^xr Propo:ai G Update Choke 10.119;17 Z15 Cr*Li,ED air- 4tiveht FIELD 1:24 10/19;2017 Figure 1:Alternative Diverter Diagram Olgoonik Construction Services I Equipment&Supplies 4 • Plug&Abandonment Plan Olgoonik-vitt ConstructionBLM-NPRA Legacy Well Remediation Services L.L.c L17PD00146/MOD 1-Wolf Creek Cluster 3 P&A Procedures 3.1 Wolf Greek #3 Wolf Creek Test Well#3 was drilled by the U.S. Navy in 1951.The last known site inspection was August 2017.At this time an ice plug was discovered at 24' MD. This well was drilled to a TD of 3,760' MD with the 16" ID casing set to 107'. 10-3/4"casing is set to 625' MD.A few gas shows were noted in the formation testing from 1,500'to 2,100. MD.Two cement bridge plugs were set with the top plug at 554' MD. Oil Based drilling mud was left in the wellbore. 3.1.1 Deviation Requests&Clarifications: 1. OCS wishes to highlight its intention to use a manually operated double gate pipe ram well control device for this well in place of a hydraulic operated annular well control device.This device will act as the secondary well control device(Diverter)for this well.This diverter system is depicted in Figure 1. 2. OCS wishes to clarify that no casing pressure test will occur.Specifically OCS will not perform a casing test as specified in 00#2 III.B.1.h. 3. OCS wishes to clarify that the planned plug(surface to 123' MD)is approved as final P&A plug for this well in variance with 00#2 III.G.2&4.Specifically the existing cement plugs at and below the Intermediate casing will be left in place, and an additional surface plug from 123' MD to surface will be placed. 4. OCS requests variance for 00#2 III.C.6. OCS requests to use personal H2S monitors in lieu of the gas detection equipment due to the open air environment used for these P&A's. 5. OCS requests variance for 00#2 III.C.7. OCS requests to omit the use of an ignition system for the flare line/ diverter line. 6. OCS wishes to clarify that the annular spacing of the OA(10-3/4"x 16") (1.54")does not allow for the collar OD of 1-1/4" rigid Schedule 80 steel pipe(1.900")(See Figure 4). Should cement not be observed at surface:entry with a %" rigid pipe will be attempted;otherwise,a top job(no annular entry)will be performed. 3.1.2 Fluids Program: Hole Size: Fluid Type: Density(ppg) 9.76" ID csg NaCI Brine system 8.6-9.8 *Ensure sufficient material on hand to make contingency kill weight brine 3.1.3 Cementing Program. Conductor P&A Plug Cement Hole Size Csg Size Type Density Yield %Excess Volume Est.TOC N/A 9.76" Class G 15.6 ppg- 0.93 ft3/sx 10 10.7 bbl Surface Artic Blend 15.8 ppg 3.1.4 Well Control Program: BOPE/Diverter 7-1/16"3M Double Gate Manually Operated Rams Upper Ram-2-7/8" pipe ram; Lower Ram-1-1/4" pipe ram CHOKE MANIFOLD 2" Choke line w/(x2) manual adjustable chokes. ACCUMULATOR N/A Maximum Anticipated BHP 0—All distinct permeable zones containing pressure have been plugged. Maximum Anticipated Surface 0-All distinct permeable zones containing pressure have been plugged. Pressure(MASP) Planned BOP Test Pressure N/A-Function Test Diverter Only Casing Test Pressure(10-3/4") none Olgoonik Construction Services I P&A Procedures • • Plug&Abandonment Plan Olgoonik construction BLM-NPRA Legacy Well Remediation Services LLC L17PD00146/MOD 1—Wolf Creek Cluster 3.1.5 Site&Well Prep Operations: 1) Move in all support equipment and rig up. Prepare well site as necessary. Install starting head. 2) RU Diverter and function test to ensure operational. o Pressure ram cavity to 200 psi for 5 min. Do not chart.Visually inspect for leaks 3.1.6 Plugging Operations: 3) Pick up work-string and dummy plug BHA,and attempt to trip in the hole to 123' MD without circulation. o Intention is to keep volume of OBM to a minimum o Line up flow path to catch displacement returns outside of the active system. o In the event that wellhead pressure or a kick is encountered, kill well with weighted brine. Contingency Procedure 1: If unable to enter to depth of 123' MD: a. Do not circulate,as this would begin the OBM displacement. b. Attempt to get past obstruction for up to 30 minutes. c. If successful: Proceed with step 4. d. If un-successful: Move to contingency procedure 2. Contingency Procedure 2: If the well is frozen/ice plug is encountered: a. Line up to catch OBM. Ensure tankage volume adequate for increased contaminated volumes. b. Circulate with heated NaCI brine while slowly tripping in the hole to 123' MD as necessary c. Catch all returns in separate containment, as to not allow OBM into closed loop system. d. Proceed with step 4. e. If un-successful:consult w/BLM for plan forward. 4) POOH, PU 10-3/4" plug and set with plug top at 123' MD per manufacturers specification. 5) Rig up cementing equipment and cement to surface with permafrost cement through the work string pumping until clean cement is observed at surface. 6) TOOH and LD work string. 7) WOC at least 12 hours. Meanwhile, rig down all mixing, pumping and related equipment and standby until wellhead has been removed(standby with required cement equipment and materials for possible annuli top job). 3.1.7 Post Rig Operations: 8) Using excavator,excavate around the wellhead to a depth up to of 6-8'below tundra level. 9) After WOC period is finished and using a cutting torch or a casing saw,cut all casing and tubing strings off to leave well severed>5'below tundra level. 10) Inspect all annuli for cement to surface. Contingency Procedure: If cement not observed in OA(10-3/4" x 16"): a. PU 3/" pipe and handling tools. b. RIH to 50'with%"workstring as well allows. c. Mix and pump artic grade cement until clean cement returns noted at surface. 11) Remove original cellar,wellhead and severed casing/tubing and prepare for transport. Olgoonik Construction Services I P&A Procedures 6 • . Plug&Abandonment Plan Olgoonik Construction BLM-NPRA Legacy Well Remediation Services Lac L17PD0O146/MOD 1—Wolf Creek Cluster 12) Top off all annuli with cement if necessary. BLM representative to witness. 13) Weld a 1/4"thick, 17"diameter steel marker plate over the top of the cut-off well casing. BLM representative to witness. o Have contingency 10-3/4" plate on location incase 16" ID casing not at surface. 14) Marker plate to have the following information bead-welded onto the top. a. Wolf Creek#3 b. API#50-119-10010-00-00 c. PTD# 100 1190 15) Back-fill excavation with original soil.Top excavation with five yards of clean gravel, mounding it over the well to compensate for settling as soil thaws. 16) Clean location,obtain site clearance approval from BLM representative on location and prepare all personnel, equipment and materials for demobilization. % • Olgoonik Construction Services I P&A Procedures • • • Plug&Abandonment Plan Olgoonik-bits Construction BLM-NPRA Legacy WellRemediation Services LLc L17PD00146/MOD 1—Wolf Creek Cluster Location of Well Cardinal No.2 Rotary Rig 5cve.r mens Sectio^.: 3,315 FVbL.4,871 FA,715;A7W,52 Umiat Meridian Spud:August 20th,1952 State r'tane Coordinates:X:563,413.65 V:5,522,118.41 Zone 5(`1A027) Completed:November 3',1952 Latitude/Longitude: 69'22'40 2515N/15330'1.0455''W j.'NAO 53,) 18'MDJTVD(pr nal Ground Leven Conductor Casing Jacket 43'of 23-5,/8'CSG cn middie two joints of the conductor) 22"OH to 119'MD/ND Conductor Casing •22'reamer ran to 115' 16":0 CSG to 107'MD/TVD 17"OH to 121'MD/ND � sranforatots! of 86' •4ssumed 16",84E,4-55 •17'reamer rar a er:trugg'irg;oget ca:a TO •113.O1'ID,14.822"Drrft,2.980 Burst,1,410 Coliapsel• Cemented arth 125 sx e'CaI-Seal(poured) Expected TOC surface 12.43 ppg 03M left in hole(11/0311952j Expected to be a 70130%emulsion based system � r Cement Plug-11/03/1952 Cement spotted from 554'—621'MD;`ND(67'I rr 30 sx tint r.4;.:,44;;-`44,-;:,:,»+ ,fi<,, Surface Casing 10-3/4%559,N-80 CSG to 625'MD/TVD (9.76'ID,9.604`Drift,6,450 Burst,4,020 Collapse) Cemented with 210 sx of High Early tint Expected TOC surface 12-1/4"OH to 652'MD/TVD Cement Plug-11/03/1952 Cement spotted from 1,447'—1,735'MO/TVD 1286') , 1205x cmt 's,•x .4z�¢ 9-7/8"OH f/652'MD t/3,740'MD/ND 7-112'°OH f/3,740'MD t/3,760'MD/TVD Wolf Creek Test Well#3 Current Completion Schematic TD:3,760'MD/ND Wolf Creek Exploration Area Olgoonik NPRA,Alaska x... i�ork.hu0l:cirt PBTD:554` API#50-119-10010 PTO#100-1190 LI Sery ces t. 10/19/2017 Elevation KB:750' RKB—GL:18' Figure 2:WC#3 Current Completion Schematic Olgoonik Construction Services I P&A Procedures 8 • , • Plug&Abandonment Plan Olgoonik Construction BLM-NPRA Legacy Well Remediation Services tic L17PD00146/MOD 1—Wolf Creek Cluster Location of Well cardinal No,2 Rotary Rig CavemmentSectier: 3,315 FWL,4,571 fNL,715,57W,S2 Umict McFd C!' Spud:August 20"',1952 State?:one Coordinates:X:563;415.68 V:5,522,1x^3.41 Zone 5(NAD271 Completed:November 3'',1952 Latitude/Langitude: 59'2140.2515'NI153 30'41.0468'W NAD 53; 18'MDJ VD LOriginal Ground Level) _ 5'Below Ground Level --L 0-3;4`Marking Plate wedded on w'th ata'weep hole O�nrw 9x�C' � J,w ry . rConductor Casing Jacket l'_'" °}Krt a-xa'4 _ 43''of 23-518'C5G 6 (on middle two joints of the conductor! v: e las Ar4xJ; 7' '.a <Ycp41rst .•v?? ConductorCasing 22"OH to 119'MD/TVD o,v .. is^iD CSG to iaa e�u:T D •22`reamer ran to-129' ' 5 4 jts ran for a total of 36' ' #i 'Assumed 16",848,1-55 17"OH to 121'MD/TVD Ivi "{15.01"ID 14 822'Drrft,2,980 Burst,1,410 Colapse}' "17'reamer rar eter strugg'irg to Set cg to TD_,. ,— ' . Cemented with 125 sx of Cal-Seal(Poured) 10-3/4"crBP top ft 223"MD/11.11D+/-/ Expeced TOC sine z P&A Cement Plug Drilling fluid le t as we'bore be o. cement p;ug .,:i:,:, Cement circulated up IA 12.43 ppg OSM left in hole(11/03/1952) . 123'MD—Ground Level Expected to be a 70i30%emulsion based system , 10.7 bbls total cement pumped(returns taken to surface! 4 645 sx Class'0'Artic Grade cmt ement Plu: -11 03 19 2 0.93 ft3{sk yseld,15.6 ppg Cement spatted from 554'-621'MDfTVDg67'j �8: '3h.h :C',X ,moi++; :* "bti?c ;, 30 sx cmc ; mot Mrs fx,Nse Surface Casing 10-314",559,N-BO 050 to 625'RSD/TVD 19.76'ID,9.60:"Drift,6,150 Burst,.4.020 Collapse; Cemented with 210 sx of High Early cmt Expected TOC surface 12-1/4"OH to 652'MD/TVD Cement Plug-11/03/1952 w . rt Cement spotted from 1,447'–1,735'MDfrvD1286'} x.xrs`Z: 120 sx cmt 9-7/8"OH f/652'MD t/3,740'MD/TVD 7-1/2"OH f/3,740'MD t/3,760'MD/TVD Wolf Creek Test Well#3 Proposed Plugging Schematic TO:3,760'MD/ND wolf creek Exploration Area Oli oonik NPRA,Alaska i (face >«,r�. l tN1..rn.JCtic7ri ABTU:4t,ar. API#50-119-10010 PTD#100-1190 1° Services,uy 10/19/2017 Elevation KB:750' RKB—GL:18' Figure 3:WC#3 Proposed Plugging Schematic Olgoonik Construction Services I P&A Procedures 9 - • S Plug&Abandonment Plan Olgoonik Construction BLM-NPRA Legacy Well Remediation Services u_c L17PD00146/MOD 1—Wolf Creek Cluster 23-5/8"Cirde ti_____---, 0 Collar -`, ---------- Drift Assumed 16", 84#,J-55 ted . . 13-3/4",55.5#,L-80 v. A. 1 . � , 4 ' a 1.54"Annular Spacing kt., ; . Atif 1.1 \ ' vi2zime.00"... • .4 OA miteitivroNAWAt OOA Wolf Creek Test Well#3 Annuli Diagram 001r.imiiiii3.6 sr sA;,. 120 r Wo f Creel(Exploration Area Olgoonik NPRA,Alaska Cul,ttrLCi<ari '"A Sevo:11,kf .- 5c;t v:..:1 API P 50-119-10010 PTD P 100-1190 413, Figure 4:WC#3 Annuli Diagram Olgoonik Construction Services P&A Procedures � � Explanation Page Permit Number These well numbers (typically beginning with 100) precede the beginning of the Commission. No permits were issued and no formal folder of record (information) created. Information known to the Commission through other agencies, journals, reports, news or additional historical means has been collected and entered into a database of Well History information. If specific information exists, these pages may be filed in this folder. Occasionally, the information has been obtained from a report that may deal with a general area and many wells. If or when possible, we may be able to 'point' the person interested in this specific well to one or more of these information sources. However, at best, this will be incomplete and independent research should be conducted to locate, if available, further information about a particular well site. o>r r • THE STATE Department of Environmental 011-1LASKL'1 GOVERNOR SEAN PARNELL RECEIVED FEB 0 7 2014 February 4, 2014 A0GCC Certified Mail, Return Receipt Requested Article No.: 7012 2210 0002 1216 2391 Wayne Svejnoha BLM — Division of Resources 222 W 7th Ave, #13 Anchorage, Alaska 99513 Conservation Division of Spill Prevention and Response Contaminated Sites Program File: 320.38.010 SCANNED 0 2 2014 Re: Potentiall Responsible Party Notice Letter and Information Request NPRA Legacy Wells - General Hazard ID: 26125 Ledger Code: 14339387 Dear Mr. Svejnoha: 610 University Ave. Fairbanks, Alaska 99709-3643 Main: 907.451.2181 Fax: 907.451.5105 This letter is to advise you that the Alaska Department of Environmental Conservation (ADEC) has identified the 136 legacy wells within the National Petroleum Reserve in Alaska (NPRA) as potential contaminated sites. Some of these wells require extensive cleanup of oil and other hazardous substances released to the environment. Since you are identified as a current or past owner and/or operator of these sites, please be advised you may be financially responsible or liable for the investigation and /or cleanup of any hazardous substance contamination that might be present. Alaska Statute 46.03.822 establishes who is liable for contamination. Records available to the ADEC indicate that you meet one or more of the following criteria: » owned or controlled the hazardous substance at the time of its release; » own(ed) or operate(d) the property or facility from which the release occurred; » owned or operated property at which the hazardous substance came to be located; and » arranged for transport, disposal or treatment of hazardous substances that were released. Site History From 1944 through 1982 the US Government drilled 136 wells to explore for oil and gas resources in the NPRA. It is our understanding that other federal agencies and some private companies may have operated or managed these sites in the past. We have also been informed that 23 of these well have been conveyed to public and private entities. The ADEC currently lists 14 of the 136 legacy wells on our database of contaminated sites. The Bureau of Land Management (BLM) is identified as the responsible party for the following sites. Wayne Svejnoha 0 2 February 4, 2014 • BLM Cape Halkett Drill Site (File # 300.38.108) • BLM East Simpson #2 (File # 300.38.109) • BLM East Teshekpuk Drill Site (File # 300.38.110) The U.S. Army Corps of Engineers, under the Formerly Used Defense Sites program, is working with ADEC under the Defense States Memorandum of Agreement on cleanup actions at the 11 Umiat test well sites. BLM is identified as the landowner in our records, and as such is identified as a potentially responsible party in addition to the Department of Defense: C Umiat Test Wells 1-11 (File # 335.38.001) The information contained in these files is part of the public record. Our databases are accessible on the Internet at: http://dec.alaska.gov/spar/csp/db_search.httn Additional Actions Needed ADEC sent a letter on July 11, 2013, identifying an additional 15 legacy well sites with confirmed releases (enclosed). As stated in the letter, ADEC recommends that BLM develop a plan to address known, suspected, and unknown releases at the legacy well sites, in coordination with the appropriate regulatory agencies. We expected a response to this letter before now. Please respond to this letter within 30 days. After we receive and review your response we will determine what additional actions will be taken regarding each site with known or suspected contamination. In addition, with your response, please complete and return the enclosed questionnaire requesting more information about past operators. In accordance with Alaska Statute Title 46, ADEC is authorized to provide regulatory oversight for any contamination response efforts initiated by the responsible party. However, if response actions by the responsible party are not satisfactory to ADEC, we may then assume the lead role in the investigation and cleanup efforts. In the event that State response actions are necessary, the responsible parties may be held financially liable for any response actions taken by the State. Alaska Statutes 46.04.010 and 46.08.070 establish cost recovery procedures for certain costs, including oversight activities, incurred by the State in responding to pollution incidents. If you are determined to be a responsible or liable party, ADEC may bill you at a later date for our expenditures associated with this pollution incident. Expenses for which we may seek reimbursement include: Staff time associated with general or technical assistance; work plan review; project oversight; general project management; legal services; interest; travel; equipment and supplies; and any contracting costs. Pursuant to Alaska Statute 46.08.075, the State may also file liens against all property owned by a person who is responsible or liable for State expenditures. Please respond in writing within thirty (30) days from the date of this letter addressing your intended actions with respect to this pollution incident. If you believe someone else is responsible for this pollution incident (e.g., a past owner or operation of the site) or if you have any questions concerning this matter, please contact Mr. Fred Vreeman at (907) 451-2181. The attached "ADEC Information Request" describes the minimum information expected in your response. Additional information may needed to evaluate the risks and responses required at each legacy well site. Sincerely, Fred Vreeman Environmental Program Manager G:\SPAR\CS\Contaminated Site Files (38)\320 National Petro Reserve Area\320.38.010 NPRA Legacy Wells General\2-2-2014 Letter\PRP Letter All Wells.docx Wayne Sveinoha Enclosure: 0 3 • ADEC Information Request Concerning Contaminated Sites BLM Legacy Wells Dispute letter date July 11, 2013 February 4, 2014 cc: Bud Cribley, Director, Bureau of Land Management Steven Cohn, Deputy Director, Bureau of Land Management Jolie Pollet, Branch Chief, Bureau of Land Management Robert Brumbaugh, Geologist, Bureau of Land Management Michael McCrum, Environmental Engineer, Bureau of Land Management Larry Hartig, Commissioner, Alaska Department of Environmental Conservation Lynn Kent, Deputy Commissioner, Alaska Department of Environmental Conservation Kristen Ryan, Director, Alaska Department of Environmental Conservation Lori Aldrich, Program Manager, Alaska Department of Environmental Conservation Steve Bainbridge, Program Manager, Alaska Department of Environmental Conservation Jennifer Roberts, Program Manager, Alaska Department of Environmental Conservation ADEC Response Fund Administration GASPAR\CS\Contarr nmted Site Files (38)\320 National Petro Reserve Area\320.38.010 NPRA Legacy Wells General\2-2-2014 Letter\PRP Letter All Wells.docx 0 0 ADEC INFORMATION REQUEST Concerning a contaminated site(s) Re: Legacy Well Sites in and near the National Petroleum Reserve, Alaska (NPRA) Please precede each answer with the number of the question to which it corresponds. Please direct any questions concerning this information request to Fred Vreeman, Contaminated Sites Program, 610 University Avenue, Fairbanks, AK 99709; Phone: 907-451-2181. Thank you for your cooperation. 1. Provide name and company affiliation of the person answering the questionnaire. 2. Provide copies of all studies, reports, and supporting information (including preaquisition assessments and work done on behalf of other parties) which you have knowledge of which address past and/or present environmental conditions at the site. Identify the name, title, address, and phone number of the party(s) who are responsible for preparing the studies or information. Information which has been previously submitted to ADEC need not be submitted again (unless specifically requested in a subsequent communication) if you can provide the name of the office (and name and title of the DEC officer if known) to whom the report was previously provided. 3. Provide a description of any ongoing or planned investigations or cleanup work at the site. Identify the names, titles and phone numbers of the individuals responsible for preparing the studies or information. 4. Provide a description of known releases at the site (date of occurrence, quantity released, type of substance released, etc.) and a description of corrective measures that were taken. Provide information on any suspected releases which may have or are occurring. 5. Describe the nature of past and present operations at the site. In particular, any actions that may have caused the release or threat of release at the site. Describe the physical characteristics of the site including major structures, water wells, fuel or waste storage systems, drainage or septic systems, etc. 6. Provide a list of any permits issued by the Department which relate to activities at the site and a list of RCRA identification numbers (U.S. EPA identification numbers) which may be held. 7. Identify persons to whom you leased all or a portion of the property and describe the nature of their operations. 8. Identify the person(s) who used the site for disposal of substances deposited there, if any. 9. Provide copies of manifests for any hazardous waste and/or petroleum contaminated materials taken to or from the site. 10. Provide a list of persons and their phone numbers and addresses of persons who have knowledge about the use of hazardous substances at the site. 11. Provide information regarding the existence of insurance coverage for damages resulting from releases of hazardous substances and copies of all such insurance policies, both currently in effect and in effect during the periods of activity in question. 12. Describe the acts or omissions of any person, other than your employees, agents, or those persons with whom you had a contractual relationship, that may have caused the release or threat of release of hazardous substances at the site. a. In addition, describe all precautions that you took against foreseeable acts or omissions of any such third parties. 13. Describe the care you exercised with respect to the hazardous substances found at the site. 14. Describe the physical characteristics of the site including structures, wells, drainage systems, etc. THE STATE July 11, 2013 'ALASKA GOVERNOR SEAN PARNELL Wayne Svejnoha Supervisory Minerals & Energy Specialist 222 W 7th Avenue, #13 Anchorage, Alaska 99513 Re: BLM Legacy Wells Dispute Dear Mr. Svejnoha: Department of Environmental Conservation Division of Spill Prevention and Response Contaminated Sites Program 610 University Ave. Fairbanks, Alaska 99709-3643 Main: 907.451.2181 Fax: 907.451.2155 The Alaska Department of Environmental Conservation (ADEC) — Contaminated Sites has reviewed the National Petroleum Reserve in Alaska: 2013 Legacy Wells Summary Report dated February 2013, containing updated information on the status of the 136 Legacy Wells located in the National Petroleum Reserve — Alaska (NPR -A), and the draft National Petroleum Reserve in Alaslm. 2013 Legacy Weiss Strategic Plan dated May 2013. ADEC has also reviewed the response by the Alaska Oil and Gas Conservation Commission (AOGC). We concur with the response by ACIGC and have no further comment regarding the priorities. We do have comments about the investigation and cleanup plans presented in the report. With this letter we arc outlining regulatory requirements related to the environmental work that is proposed and required as part of these cleanups. ADEC is concerned that the 2013 Legacy Wells Strategic Plan prepared by the BLM does not include either assessment of the contingency for assessment of known, likely, or unknown but possible contaminant releases. In addition, BLM plans for surface cleanup of these wells should be made clear in the plan. At least one of these legacy wells has extensive PCB contamination and has resulted in a multi-year cleanup totaling tens of millions of dollars. At others, solid waste disposal practices have resulted in releases to the environment with estimated cleanup costs in the hundreds of millions. Known releases documented in the records we reviewed include crude oil, gasses, refined oil and fuel, drilling fluids that include various organics, metals, and other chemicals, and unknown contaminants from drums and other containers observed to be damaged and abandoned at the various well sites. There are 13 legacy well sites with known releases currently on the DEC contaminated sites list. Many of these are in the process of being addressed, cleaned up, and closed. From our Waited records review there are 15 additional legacy well sites with confirmed releases. These should be prioritized for initial records reviews and then added to the BLM contaminated sites list under our cooperative agreement. Suspected releases include fuel releases from operations, storage, and fuel spills at the sites, impacts to various surface water bodies from spilled fluids during drilling and breaches of containment at reserve and flare pits, continued surface runoff from drilling fluids uncontained at several sites, and down -hole substances that were ejected from the holes over time or during blowouts or drilling operations. 1 Wayne Sve noha ? July 11, 2013 Y The.BLN-1 plan to address these known, suspected, and unknown releases at legacy well sites is notably absent from the documents presented to date. The three primary regulatory agencies that need to be involved in the plan are ADEC — Contaminated Sites, Alaska Oil & Gas Conservation Commission, and ADEC — EH/Solid Waste. Other agencies will need to be consulted. as well. Below we provide recommendations for a coordinated plan using the Uniform Federal Policy for Quality Assurance Project Plans (UFP-QAPP) that will involve all of the regulatory agencies in one coordinated manner. This will allow BLM to address these sites in a consistent and coordinated project which fulfills all of the regulatory requirements so that the sites do not need to be re -visited in the fu=e xvhen they are closed after this project. Attached are our comments on each specific well. The acronyms used on the list include terms that are typically used in a CERCLA type investigation however they are also suitable for investigations conducted under the State of Alaska cleanup rules. These include the following; Historical Records Review (HRR) 'chis is recommended for almost all of the well sites. Much of the information required for these reviews is already contained in various reports and appendices or in BLM files. The Historical Records Review should document the type of releases that might have occurred from drilling operations as well as historical use of the site, and should capture all available information on the drilling fluids used and any product produced or released. Preliminary Assessment (PA) This is recommended for almost all of the well sites. A Preliminary Assessment is a limited scope investigation that provides an assessment of information about a site and its surrounding area to distinguish between sites that pose little or no threat to human health or the environment and sites that require further investigation. The PA is a CERCLA defined document and typically does not require sampling. Site Inspection (SI) If the PA recommends further investigation, then an SI is necessary. The SI is a CERCLA defined document, and it is analogous to an initial report of contamination under state cleanup rules. On some legacy well drillings sites it is evident now that an Sl is required just from a review of the reports. An SI investigation typically includes the collection of samples to determine what contaminants are present at the site and whether they are being released into the environment. An approved site specific workplan is required under both CERCL-A and 18 AAC 75 prior to SI sampling. The SI typically is not intended to develop a full site characterization, but is limited to determining the presence or absence of a release. If contamination is found after completion of the HRR, PA, and SI then a RI/FS under CERCLA, or a Site Characte-rizatiowlteportandcleanup-Alas,under-l-fi-AAC7iis`required. -- ----- - -- — --------- - DEC recommends that BLM incorporate into the strategic pian the processes outlined in this letter. A team of agencies composed of AOGC, DEC -CS, EPA as required, and DEC -EH should address regulatory and technical requirements for these well closures. By cooperating and working together with the regulatory agencies BLM will save time and expense, and regulatory uncertainties will be avoided. The strategic plan should reference a project to prepare a generic workplan. DEC suggests that BLM utilize the generic UFP-QAPP workplan format for the required environmental work. If properly prepared, the workplan could encompass most of the investigations and cleanups required at these sites over multiple years. At other multi -site projects we have found this to be an effective way to reduce uncertainties and risk in these types of investigations. A very small site specific FSP could then be developed as BLM approaches each drilling site. Regulatory decisions made during workplan development would provide more certainty in the planning process for cleanups. G:\SPAR\CS\federal F2cilitie3\Ci%ih2n 1-cdcrrt Agr=ics\DOl\B[.nl\1'roiens\lxgAey Wells\7 11 13 Luter to KIN on lxbxy wells.doex Wayne Svejnoha 3 0 July 11, 2013 Please review the attached list of specific sites. If you have any questions, please do not hesitate to call me at 907-451-2181 or by email at fred.vreeman@alaska.gov. I look forward to working with you as the Federal Government fulfills its requirement to clean up these well drilling sites in Alaska. Sincerely, y' Fred Vreeman Environmental Program Manager Enclosure: SPAR Response with Legacy Wells cc: Bud Cribley, State Director, Bureau of Land Management Steven Cohn, Deputy State Director for Resources, Bureau of Land Management Jolie Pollet, Branch Chief, Bureau of Land Management Robert Brumbaugh, Geologist, Bureau of Land Management Michael McCrum, Environmental Engineer, Bureau of Land Management Cathy Foerster, Commissioner, Alaska Oil and Gas Conservation Commission Larry Hartig, Commissioner, Alaska Department of Environmental Conservation Kristen Ryan, Director, ADEC Division of Spill Prevention and Response Steve Bainbridge, Program Manager, ADEC Contaminated Sites Program Jennifer Roberts, Program Manager, ADEC Contaminated Sites Program GASI'AR\CS\Fedcrrl Fo61ibLy\Gvi6n Falctul AgcnnCs\DOI\BI.N1\Proitcts\lA'6.1' q W03\7 11 1314tur to Aim\I on Ug2cy Wclls.doex Well Name operator I RP I Land Simpson Core Test #5 1! Na 1 BLM Simpson Core Test #6 US Na I BLM Simpson Core Test #7 us Na 1 Bl. M Sin son Core Test 98 US Navy 113LM Si son Core Test #9 U5 Na I BLM Sinwson Core Test #1f) U.S Navy! BLM Core Test #11 AOGCC Subsurlaca I BLM Core Test #12 FUSNa a I BLM Core Test #16 a 18LM Core Test #17 US Na 1 BLM Core Test 018 US Na I BLM Core Test #19 US Na 1 BLM t Core Test #20 US Navy 1 BLM i Gore Test #21 2S Na 1 BLM I Core Test #22 US Na 111•LM I Core Test dnlf fluids left in hole i BLM Core Test �#2vy I BLhA n CareTest #25 US Na Y I BLM K Core #1 US Navy i BLM 1 -t- *1 SPAR Response with Legacy Wells Lisl.xlsx 2013 Risk Ity CSP Status I Fito tllHazid Rolea5e7 Nnne None IYOMWil Low RNooe ane Nona Unused, Unused. I None Unused, i None Uncased, None None None None (None Unknown Unknown Page 1 of 14 •I AOGCC Subsurlaca AOGCC Surface SPAR W arkgroup Notes Status Status Need HRR, PA, S1 no data no data Need HRR. PA. SI no data no data Need PA ind drill fluid assessnsenl & workplan drillin 11uids left in hole no data Need PA ind drill fluid assessment & work an drilling fluids left in hole no data Need PA incl drill Ifusd assessment & work Ian dnlf fluids left in hole no data Need PA nc drill fluid assessmcnf &work Ian dnllxs fluids left rn hale no data well skc-lch provided by Need PA ind drill fluid BLM not consistent with assessment & work Ian AOGCC or BLM data no data Need PA ind drill fluid assessment & work Ian dnflin fluids left in hole no data Need PA and 51 ind 13611 fluid assessment. workplan rid sampling stressed debfis, partially as blowout and fire rove elated site areas Need PA incl drill fluid assessment & workplan dn lling fluids left in hole no data geed PA ind drill fluid assessment & wOTk Ian drij I ing fluids teff in hole no data Need PA incl dfifl nutd assessment & work Ian drillin fluids left m holo no data Need PA incl drill fluid assessment & work Ian drillin ituids left in hole no data Need HRR. PA, SI no data no data Need PA incl drill fluid assessment & work Ian drillin fluids felt in hole ria data Need PA incl dnll fluid assessment & work larx drillin fluids left in hole no data Need PA incl drill fluid assessment & work Ian drillin fluids Teff in hole no data Need PA ind dnll fluid drflfing fluids and ball assessment & work len peen hammer left in hole no data overshot, drill collar, rock revegelated —131 Need HRR, PA bit, and N -reds left in hole can't find it Review Report as PA. No evidence of sheen, stressed veg, or drilling Not abandoned, waste on surface. Veg ----_— , ,raw,, plunaed to surface site not cleared •I SPAR Response with Legacy Wells LisLxlsx Page 2 of 14 is • vi nce o BLM 2013 Risk Historic AOGCC Subsurface AOGCC Surface Well Name Operator I RP I Land Mgr Priority CSP Status file #IHazid Release? SPAR Workgroup Notes Status Status plugging operations inadequate and Wellhead tell as Umiat 43 US Navy I BLM I FUDS None pending dos 335.38.00113092 Yes. see file 'Plugged by BLM in 2004 incomplete historic site? plugging operations inadequate and Wellhead left as Umiat #4 US Navy I BLM / FUDS None pending dos 335.38.001!3079 Yes, see file Plugged by BLM in 2004 incomplete historic site? plugging operations inadequate and Wellhead left as Umial 98 US NaMy I BLM I FUDS None pendinq dos 335.38.001/3D81 'Yes, see_ _file Plugged BLM in 2004 incomplete historic sile? plugging operations inadequate and Wellhead left as Umiat #1'0 US Navyj BLM_I FUDS None pendingdos 335.38.00113082 Yes, see fila Plu ed by BLM in 2004 incomplete historic site? Need HRR, PA, SI with sampling. Drilling mud assessment. Surface Plugged to 7868'. Drilling Cleanup. Photos - evidence mud and diesel to Awuna #1 USGS I BLM Medium None None Yes of erosion into lake surface. > 100 _Pylons Need HRR, PA, SI with sampling. Drilling mud Wood , metal, assessment. Surface Plugged to 2039'. Diesel plastic debris. Fast Simpson #1 USGS I BLM Low None None Yes Cleanup. to surface. >10D Pylons Need HRR, PA, SI with Wood and metal Drilling mud assessment debris. Pylons - Photos straw areas of no Plugged to 2047'. Diesel Tankage for lk ' #1 USGS / 8LM Low None None Yes ve elation. to surface. flammable fluids Need HRR. PA, SI wdh sampling. Drilling mud assessment. Surface Plugged to 1400'. Drilling Wood and metal Koluktak #1 USGS I BLM Low None None LYes Cleanup. mud & diesel to surface debris Pylons Need HRR, PA, SI with sampling. Drilling mud assessment. Surface Plugged to 1894'. Diesel Wood and metal Ku am 91 USGS I BLM Low None None Unknown Cleanup. to surface debris. Pylons Need HRR, PA, Sl with sampling_ Drilling mud assessment_ Surface Plugged to 4464'. Drilling Wood & metal Kuyanak #1 USGS I BLM Low None None Yes Clean mud & diesel to surface debris. Pylons Need HRR, PA, SI with sampling. Drilling mud assessment. Surface Cleanup. Photos show Plugged to 1840'. Diesel Plastic and metal Lisburne 41 USGS I BLM Low None None Yes stained soil to surface debris. Need HRR, PA, SI with sampling. Drilling mud assessment. Surface Plugged to 8192'. Drilling Wood and metal North Iii ok $1 USGS I BLM Low None INone Yes Cleanup. mud & diesel to surface debris - Page 2 of 14 is • Well Name Peard South Meade #1 1 RP 1 Land 1BLM BLM #1 4USGS ! BLM SPAR Response with Legacy Wells Usl.xlsx ;013 Risk &W CSP Status File XlHazkl T Page 3 of 14 AOGCC Subsurface AOGCC Surface WAR Workgroup Notes Status r Status � deed HERR, PA SI with iampling. Dining mud rssessment- Surface ;leanup. Site photos show areas of stressed iegetalion. No issues Plugged to 2232'. Diesel Wood and metal soled in USGS re ort. to surface debris. Pylons Need HRR, PA, SI with sampling_ Drilling mud assessment Surface Plugged to 2026'. Diesel Wood and metal Cleanup. to surface debris. P Ions Add to She list. Need HRR, PA, SI with sampling. Drilling mud assessment. Surface Cleanup. Od reported bubbling to the surface within reserve pit in 1982. Oily residue and sheen observed adjacent to east side of reserve pil, down hole material at the Plugged to 1875. Diesel Wood and metal surface to surface debris. P ons Add to Site list. Need HRR, PA, S) with sampl'uig. Drilling mud assessment - Surface Cleanup. Reserve pit berm had breaches anowirrg water to exit. Oil - stained sediment was observed above the Plugged to 1478'. Diesel Wood and metal waterline of the I. to surface debris. Site photos may show hydrocarbon sheen on Plugged to 2600'. Drilling Wood and metal water in well cellar mud & diesel to surface debris. Pylons Add to Site list. Need HRR, PA, SI with sampling. Drilling mud assessment. Surface Cleanup. Berms have been breached an allow water to flow out of reserve piUllare pit. Rising bubbles of ail observed in Hare pit 1484. Photos Show Plugged to 1825'. Diesel Metal debris. ra.. v-1 v.nnnralinn to Surface ... 0 •I SPAR Response with Legacy Wells Lisl.xlsx Page 4 of 114 0 0 vi encs o BLM 2013 Risk Historic AOGCC Subsurface AOGCC Surface Well Name Operator 1 RP f Land Mgr Priority CSP Status File #fHazld Release? SPAR Workgroup Motes Status Status Need HRR, PA, Sl wrlh sampling. Drilling mud assessment Surface Cleanup. Breaches in bemi allow water to flow into and out of reserve pit, sheen on Plugged to 2700' Diesel Wood and metal West Dease #1 USGS l BLM Low Nona None Yes surface water in well cellar to surface debns. Pylons Add to Site list. Need HRR,. PA, SI with sampling. Drilling mud assessment. Surface Cleanup. Water flows into the pits through breaches on the eastern berm and out of the pits through breaches on the northern and western berms. Downhole material Plugged to 228'9'. Drilling Wood and metal South Harrison Bay #1 USGS f BLAB Low None None es Present at surface mud & diesel to surface debris. Add to Site list. Need HRR, PA, SI with sampliing. Drilling mud assessment. Surface Cleanup. Stressed vegetation noted and apparent in site pholos. Plugged to 2443'. Drilling West Fish Creek #1 USGS 1 BLM Low None None Yes Drilling mud around well mud & diesel to surface Pylons Need HRR, PA, SI with sampling. Drilling mud assessment, Surface Cleanup. High TPH Plugged to 1977'_ Drilling wellhead sticking concentrations underneath mud under plugs. Diesel up. Wood debris. Fast Simpson #2 USGS 1 BLM I Low _ Active 300.38.10912691 Yes, see file the rig inundation to surface Pylons South Barrow 94 US NavyiNorth Slope Bono None None None Unknown Need Surface Status completed gas well - no data South Barrow #5 USAF - BLM Unknown None None None. Unknown Need Surface Status completed gas well no data South Barrow #& US Na /Norlh Sto Burg None None None Unknown Need HRR, PA, St no data no data South Barrow #9 US NavyfNarih Slop2 Boro None None None Unknown Need HRR, PA, Sl no data no data _ South Barrow #10 US Navyfflorlh Sto Bora None None None Unknown Need Surface Status com ted gas well no data South Barrow It12 US Na /North Slope Baro None None None Unknown Need HRR, PA. Sl no data no data BLM well skMh not consistent with AOGCC South Barrow #14 US NavyMorth Sloe Boro None None one Unknown Nsed HRR. PA, St data no data Need PA ind drill fluid well left filled with drilling South Barrow #16 US NavyiNotih Slope Bora None None None Unknown assessment & workplan mud and diesel no data Need PA incl drill !turd tubing in well. no perfs, Soulh Barrow 017 US Na /North Sloe 13ora None None None jUnknown assessment & work fan I unknown fluid, I no data Page 4 of 114 0 0 SPAR Response with Legacy Wells Lisl.xisx Page 5 of 14 •I E CYfuu .v v AOGCC Subsurface A Surlaco TEHILM T013 Risk CSP Stilus File #IHaaid Historic Rekeasa7 SFAR YUnrkgroup Nates 5latus at US $1<ntus Well Name flperatar f RP f Land Mgriority Unknown Need Surface Status corn feted as well no data 5aulh Barrow #18 US Na INorlh Slo a Bora None None None Unknown Need HRR, PA, St no data no data Walak a #1 USGS! Unknown None None None rsg 890`. Multiple cement plugs of unknown volume. Shallowest None None Unknown _ Need HRR, PA, SI SOD' no dada Gubik #1 US Na d Ur#cnown Low Add to Site list. Need HRR. PA. SI with sampling. csg Q SOD' Well blowout Drilling mud assessment. from zone al 1SOT during Surface Cleanup. Photos plugging operations show disturbed/ slashed Plugging never completed after blowout. no data Gub* #2 US Na ! Unknown Low None Nora es areas two downhole Dement plugs of unknown depth Mone None Unknown Need MR. PA. Sl and volume no data Grandstand #1 US Navy 1 Unknown None Add to Site list. Need HRR. PA, SI with sampling. Dnliing mud assessment. Surface Cleanup Sediment from the reserve pit was excavated and spread over the pad to drill a 2nd well at this location, Upon completion of the 2nd well. the sediment was pushed back into ft reserve pit.. Area does not appear to be revegetaling. perhaps from the presence property plugged but no of drilling mud at the data on abandonment None None Yes surface status no data W 7 Foran #1 " USGS I Unknown Low on Site list. Need HRR, PA, SI with sampling. Drilling mud assessment. Surface Cleanup. Slressed vegetation, photos show plugged, but not open csg; metal & Active 306.3$.108f2689 Yes. see file site underwater abandoned at surface corwsele debris under 5' of water, Cape Halken #1 " US Na (Unknown Low None Unknown !Need HRR, PA. SI es to 27' open C_s Min a Veloei #1 U5 Na f t3LM one None csg @ 31" 280' of drill pipe, drill collar, and Core Unknown Need HRR. PA, SL barrel left rn hole. rove etaled Ournalik Core #i US Na / BLM None -No obsery None !None Page 5 of 14 •I E SPAR Response with Legacy Wells Lisi.xlsx Page 6 of 14 • • WI F3nCe Q BLM 2013 Risk Historic AOGCC Subsurface ADGCC Surface Well Name Operator t RP I Land Mgr Priority CSP Status File #IHazid Release? SPAR Workgroup Notes Status Status Need HRR, PA, Workplan for St with Sampling. Drilling Mud Assessment. Surface Cleanup. Photos show debris, stressed No csg. 15' of drift pipe Oumalik Caro #2 US Navy 1 ULM Low None None yes ve elation and rock hit left in hole. no data Need HRR, PA, Workplan for Si with Sampling open csg & other Drillip) Mud Assessment. piping sticking out Surface Cleanup_ Reports of ground; wood, of debris, drilling muds on melat, conciele Oumalik Core 011 US Navy 1 BLM Low None None Yes surface (__q to 9', debris open csg sticking out of ground; wood & metal 0umalik Core #12 US Navy I BLM Low None None No Need HRR, PA, SI no data —__—debris _„ debris buried by landslide. Need HRR, PA, St, Well not no dala on Sentinel Hill #1 US Navy 1 BLM Low None None Unknown ap panent in site Rholos Csq to 3t1'. underwater status Need IQR, PA, SI. No evidence of sheen, open crag slightly stressed veg, or drilling above ground waste on surface. Veg 37' of csg, drilling fluids level; wood and S imp son Core Test #1 US Navy 1 BLM Low None None No appears healthy lett in hole metal debris Need HRR, PA, St. No evidence of sheen, stressed veg, or drilling waste on surface_ Veg 76'01 Csg, drilling fluids Simpson Core Test #2 US Navy I BLM Low None None No appears healthy left in hate no data Need HRR, PA, Sl. No evidence of sheen, stressed veg, or drilling waste an surface. Veg 61' of csg, drilling fluids Sim sun Core Test #3 US Navy I BLM Low None None No appears healthy left in hole no data Need HRR, PA, St. No evidence of sheen, stressed veg, ordrilling waste on surface. Veg --60' of crag, drilling fluids Sim eson Core Test #4 US Nayy t BLM Low Norse None No apecars healthy left in hole no data Need HRR, PA, St. No evidence of sheen, stressed veg, or drilling waste on surface. Veg csg cemented @25% open csg sticking Songsoncore Test #13 US Na 1 BLM Low None None No appears health dritin fluids IeR in hole_ out of round Need HRR, PA, SI. Vegetated, no evidence of crag cemented @2D'; open csg sticking Simpson Core Test #14 US Navy ! BLM Low None None No release. drillin fluids left in hole out of ground Page 6 of 14 • • SPAR Response with Legacy Wells Lisl.xlsx ism son Core Fest #26 t=vrdence or Medium AOGCC Subsur(aen ADGGC Surface 13LM 2013 Risk CSP Status File WHazid Historic Retease7 SPAR Wwkgroup Notes Status Status Well Name operator r RP 1 Land Mgr Priority Unko Need HRR, PA. SL US Na ! $LM open casing None Nave Vegetated. no ev4dence of cog set shallow; drilling slicking nut of Low No release- fluids left in hole round Simpson Core Teri #14a US Na !BLM Low None None & weilhead slick Need HRR. PA, SI crude nil left in hole open casing Need HIR, PA, Workplan Vegetated, no e+wdence of csg cemented 12181; slicking out of openregd ng No release. drillingfluid left in hole round Simoson Care Tesl #15 US Na !BLM Low None None d wooden Oellar, Need HRR, PP, SL Sate a9 r�110'. dolling fluids wood 8 metal ism son Core Fest #26 US Na ! BLM Medium None None res Sim sen Core Test 027 US Na J 13LM IJone None None Unko Sim son Gore Test #28 US Na ! $LM Low None Nave Yes clmnnnn Core Tesl #29 US Navy! BLM Low Norte No No Simpson Core Test 030 US Na 1 !BLM Core Test #30a JUS,Navy 1 BLM Low `None Prone n Gore Test #31 JUS Navy/ BLM None Page 7o(14 photos appear to show oil at surface, from a natural csg Q 350'. Completed in oil seep, seep, also drilling mud in oil well Open perfs. At 1welhead sticking sacks on the tundra one lime capable of up_ metal debris PI u ed b BLM in 2004. unassisled flow. and rustingbarrels 'Need HRR, PA, St. Site photos appear to show Oil csg cemented at surface, from a natural @i02;dnllutg fluids nn oily ground; csg seep- Plugged by BLM in including diesel and & weilhead slick vin 20014 crude nil left in hole out of ground Need HIR, PA, Workplan for Sl with Sampling- openregd ng ❑rilling Mud Assessment . out grouunnd in Surface Cleanup. Site d wooden Oellar, photos appear to show a p le of drilling mud about a9 r�110'. dolling fluids wood 8 metal 160 feel tram the welt tell in hole debris. Solid waste Need HRR, PA, Sl_ No evidence of sheen, stressed veg, or dri" waste on surface. Veg csg cemented at 1S2'; open csg. Wood a ears healthy dnknq fluids lett in hole and metal debris Need HRR, PA, SI. frilling mud at surface. but well is also in the middle of a large in oil seep; Open oil seep and surrounded by cog sticking up; pooled oil. Plugged by BLNI csg cemented A150'; wood & metal ser Holes in 20514- drillin fluids left in hole detail on oily ground; tog Need HRR. PA, Sl. Well is wellhead slick in the middle of a large oil seep and surrounded by csg cemented at 100% out of ground. pooled oil. Plugged by 131. dulling mud left in hole. wellhead leaking see noses in 2004 gas blowout at 423' gas Need HRR, PA, St. Leaky valve replaced in 2001, little evidence of contamination following valva on city ground; reg replacement- Plugged by csg cemented at 100'; & wellhead stick see notes BLM in 20174 iddifing fluids, left in hole out o1 round SPAR Response with Legacy Wells List.xlsx Page 8 of 14 • • yr enco o BLM 2013 Risk Historic AOGCC Subsurface AOGCC Surface Well Name Operator f RP f Land Mgr Priority CSP Status File glHasid Release? SPAR Workgroup Notes Status Status Need HRR PA, Workplan csg Cemente=d al for Sl with Sampling. 1028', cement plugs a1 Drilling Mud Assessment. 6387' and 5520'. Fish in Surface Cleanup. Drilling hole, drilling fluids Iefs in No data. Open Simpson Test Welt #1 ak US Navy1 BLM Low None INone yes muds near wellhead hale casing Need HRR, PA, Workplan for Sl with Sampling. Dolling Mud Assessment. Surface Cleanup Also Wellhead sticking evidence of a natural seep- above ground, Tar sheens in the summer ST from 2552 to 3018. wood, melel, and months. BLM is concerned csg @2915. Slotted liner concrete debris. Fish Creek #1 US Navy I BLM Medium None None Yes about exposure to wildlife to TO. Completed oil well Rusting barrels Need HRR, PA, Workplan for SI with Sampling. rasing cemented at 48; Drilling Mud Assessment. gas 0mv and explosion Surface Cleanup. Small gas while drilling at 863'; hole leak in wellhead flange, will Filled with fresh water to Wolf Creek 91 US Navy f BLM Low None Nano No flow if the valve iso en 330' No data. csg cemented a[ 53';hole left tilted with fresh water, Wolf Creek 02 US Navy 1 BLM Low Noire Nona No Need HRR. PA. Sl. fish in hole csg cemented at 107'; No data bridge plugs from 1447 to 1735 and from 554 to Wolf Creek #3 US Nayy I BLM Low None None No Meed HRR, PA, SI. 661, No data Add to Site list. Need HRR, PA, SI with sampling. csg slicking out of Drilling mud assessment ground with wood Surface Cleanup. Sheen on plug on top; solid surface water in well cellar, csg cemented at 30'; drill waste; wood hundreds of drums indicate pipe, drilling mud and debris; about 200 Skull Cliff Core iesl #1 US NaMy I BLM High None None Yes polential for cornlamrna[ion diesel left in hole nisling barrels Need HRR, PA, SI. Two open csg, wood drums are floating on a building; pylons; pond near the well. csg cemented at 1000', wood & metal Kaolak 01 US Navy 1 BLM t ow None jNone lNo Potential for hurried landfill. fdriltingluidsieftin hole debris Page 8 of 14 • • SPAR Response with Legacy Wells Lisl.xlsx 181-11119013 Risk Well Name Operator f RP ! land Mgr Priorlty CSP Status File 1NHazid #1 1 U Navy 19LM #1 JUS Navy/ umatik Ill US Na I BLM Low None None as[ Oumalik #i US Na !BLM Low None None #1 N East Topagoruk #1 USN l BLM Kniteblade #1 US Navy l BLM Page 9 of 14 Subsurface `AOGCC Surface SPAR Workgroup Notes Status Add to Site list. Need HRR, PA, SI with sampling. open flange Q Drilling mud assessment. Surface Cleanup. Drilling Gas well. Open ports. ground level. Mud pile overgrown with Drilling fluids and Metal & wood v , etallon and lichen tubulars lett in hole debris Need HRR, PA, SI. No evidence of sheen, stressed veg, or drilling csg cemented at 502'; open casing slicking out of waste on surface. Veg plug at 3470 to 3511'; ground. Wood appears heall drilling nuids left in hole debris. Open casing below Add to Site list. Need HRR, ground level. PA, SI with sampling- Revegetated. Drilling mud assessment. Numerous metal Surface Cleanup. Debris csg partially cemented at I support structures and drilling muds. Stressed 2762'. Plug at 2543% slicking up. vegetation Dridin mud left in hole Concrete debris, plate welded to pipe: l' of pipe rsg cemented at 1100'. sticking up - Need HRR. PA. SI. Drig fluids left in hole Wooden debris. Add to Site list. Need HRR, PA, SI with sampling. Driving mud assessment. open csg broken Surface Cleanup. Downhole material present csg cemented at 6073'. off and sticking up: at surface, area mostly original hole drilled to wood, metal, revegetated. Diesel still 7154'& junk len; concrete and other occupies the ground sidetrack hole left wilh debris. rusting dreulatioir lines. drillina fluids barrel Add to Site list. Need HRR, PA, SI with sampling. Dolling mud assessment. Surface Cleanup. Pile of tsg 10 1100'; pkig al open casing drilling muds is next to the 1049% drilling mud below sticking up. Wood, teller. No offical reserve pit plug: unknown fluids in metal, and glass noted o en hole debris. open casing Need HRR, PA, SI. BLM sticking up. Wood, stales that there was no metal, and glass debris at this site in 2012. csg cemented at 420% debris - •I 0 SPAR Response with Legacy Welts Lisl.xlsx Paye 10 of 14 0 0 w once a BLM 2013 Risk Historic AOGCC Subsurface AOGCC Surface Well Name Operator I RP f Land Mgr Priority CSP Status File #IHazid Release? SPAR Workgroup Notes Status v F Status open casing sticking up. Wood, metal, & concrete debris rusting Need NRR, PA, SI. Reports barrels. One indicate solid waste csg cemented to 45';fish marked flammable Knileblade #2 US Navy I BLM Low None None No drums in hole hazard. open casing slicking up; metal & Krideblade #2a US Navy 1 BLM Low None None No Need HRR, PA, SI. csq cemented at 38% concrete debris Need HRR, PA, SI including learning assessment. Site partially No wellhead. submerged intermittently csg cemented at 80; Metal. Solid waste North Simpson Test Wel 4 US N2n I BLM Low None None No during the summer dri0ing fluids left in hole ? No dala crude wellhead. Need HRR, PA, St. Surface csg cemented at 685'; Wood and metal Umiat 01 US Navy J BLM I FUDS Medium Cleanup co 335.38.00113090 Yes, see file Cleanup drillinq fluids left in bole debris No wellhead. Gravel pad partially csg cemented a1486; revegelaled wood Need HRR, PA, SI. Surface cement plug from 440 to debris and pipe Umiat #i t US Na I BLM I FURS Low pending dos 335.38.00113083 Yes, see file Clea 490'; sticking u csg cemented at 7206'; vVefNwad- Gravel various plugs from 8250' pad revegetaled 7 South Sirnpson 01 US Navy I BLM Low None None Yes Need HRR, PA, SI. to surface No data Add to Site list. Need HRR, PA, SI with sampling. Drilling mud assessment. Surface Cleanup. Large quantifies of ferrous oxide, zinc oxide, zinc carbonate, and barium sulfate were added to drilling muds. Stains apparent in photos. BLM field camp an site. Walls between the reserve and Pare pits have eroded. Wellhead and Water flows into surface gravel pad. ? No Wook #1 USGS I BLM Low lNone Name Yes water during break22L no data data Paye 10 of 14 0 0 SPAR Response with Legacy Wells Lrsl.xlsx BLM 2x13 Risk Well Name 10porator I RP I Land Mgr Priority CSP Status I File #IHazid Arca- Barrow Cure #1 US Na l til.M Avak 01 US Navy I BLM Barrow Bi R' #1 US Na I BLM Barrow Cafe Rig Test 91 US Na I BLM #2 I US Navy I BLM #1JUS N,a I BLM H' h NOr1e None Test Well #1 US Test Well #2 US Barrow Test Wetl #31115 Na IN©r1h Slo c Bora IAedium None None Unknown Page 11 of 14 Subsurface -FAOGCC Surface SPAR IWorkgfoup Notes Status _ ___ araiu5 Need HRR, PA, SI. Surface Cleanup, Photo CIMG0218 csg cemented at 53` shows area of disturbed tubing hung to 708': hole open casing vegetation that should be heft filled with drilling mud slicking up; wood & investi algid durin Sf and diesel metal debris open casing Need HRR. PA, St. Surface csg cemeoled at BIF. sticking up; wood & Cleanu-. lu set at 1348' metal debris Not abandoned, site not cleared, Need HRR, PA, SI. Surface open easing 7? No Cleanup no data data Not abandoned, site not eteared, Need HRR. PA, SI. 'Surface open casing 77 No Cteanu no data data Need HRR, PA, St with sampling. trilling mud assessment. Surface Cleanup. Drilling Muds on Not abandoned, site -slowly revegelatmg site not igred, More information on drilling open casing 7? No mud specifics rs being researched no data data Need 1lRR, PA, SI wdh sampling. Drilling mud wellhead leaking assessment. Surface cemented Csg to gas!? Wood & Cleanup- Cellar does not 1270;slotted liner to metal debris. Area retain water 1956': tbg to 1939 affected 50'x50' Need HRR, PA. SI. Drilling Csg cemented at mud assessment. Surface 441'.hole Iell willed with open pipe; metal & Cleanup- On mads stem water concmie debris Need HRR, PA, Sl. Drilling Csg cemented al 2260'; mud assessment- Surface periorated liner to TD. wood, metal & Cleariu . fln road s stem lin Completed well. Conerete debris Need HRR, PA, SI with sampling and workplan. Drilling mud assessment. Surface Cleanup. Drilling +csg cemented at 10461: open c5g slinking mud at surface. Sheen on hole left filled with drilling up; wood & metal surface wafer in well cell larQuids and wafer. de" 0 SPAR Response with Legacy Wells Lisl.xlsx Well Flame Operator I RP I Land Mgr BLM 201$ Risk Priority CSP Status File #ltiazid yr once oF— Historic Release? SPAR Workgroup Notes AOGCC Subsurface Salus g AOGCC Surface Status no data. Likely revegetaled. Removed from our list of wells of concern in < 50', no csg, no API#, October, 2012 Oumalik Foundation Tess A US Navy I BLM None-uncased hc None None lUnknown Need HRR, PA. not in AOGCC database Monlht Meeting no data. Likely revegetated. Removed from our fist of wells of concern in < 50', no csg, no API#, October, 2012 Cumalik Foundalion Test b US Navy I BLM None-uncased hC None jNane Unknown Need HRR. PA, not in AOGCC database Monthly Meeting no data. Likely revegetated. Removed From our irsl of wells of Concern In < 50', no csg. no API#, October, 2012 Oumalik Foundation Test A US Navy I BLM None-uncased hc None lNone Unknown Need HRR. PA, not m AOGCC database Monthly Meeting no data. Likely revegetated. Removed from our list of wells of concern in < 50', no c5g. no APF#. Odubut. 2012 Oumalik Foundation Test A US Navy I BLM None-uncased ht Nune lNone Unknown Need HRR, PA, nal in AOGCC database Monthiv Meetin no data. Likely revegetaled. Removed from our Ilst of wells of con cam in < 501, no csg, no APi#. October, 2012 Oumatik Foundation Test 0 US NavyI BLM None-uncased hc None None Unknown Need HRR. PA, not in AOGCC database Moral Meeting no data. Likely revegetaled. Removed from our list of wells of concern in < 50', no csg. no API#, October, 2012 Ournalik Foundation Test 4US Navy I BLM None4xwased h_j None None Unknown I Need HRR. PA, not in AOGCC database Month Meetin Page 12 of 14 0 Page 13 of 14 SPAR Response with Legacy Wells LrsLxisx Well Name BLM 2013 Risk Operator f RP I Land Mgr Priority Historic CSP Status Fife #IHazld Rslease7 AOGCC subsurface Status �__ - -_-�� . A013CC Surface Status no dala. Likely SPAR 1Norkgroup Nates revegelaled. Removed from our list of wells of concern in < 50'. no csg, no AP IN, October, 2012 Oumalik Foundation Test US Na!q BLM None -encased h None None Unknown Need HRR. PA. not w AOGCC database MonthlyMeetin no data. Likely revegelated. Removed from our list of wells of concern in < 501. no csg, no API#, October, 2012 Oumalik Foundalion rest U5 Na I BLM None -encased h None None Unknown Need HRR, PA, not in AOGCC database Monihl lAeeli no data. Likely revegetaled. Removed from aur fist of wells of concern in 0urn alik Foundation Test US Na 18 LM None -encased fi None None ilnknown Need HRR. PA, < 50', no csg. no API#, not in AOGCC database October, 2012 Month! Meetin no data. Likely revegetated. Removed from our list of wells of concern In < 50', no csg, no API#, October, 2012 Oumalik Foundat'Gon Test US Na I BLM None encased h Nome None Unknown Need HRR, PA, not m AOGCC database Month! Meeting property abandoned per then -applicable South Banow #7 US NEILM 2LI None None Unknown Need HRR. PA, ro erl lu ed re s no data to support proper Um -Qt 02 US N Noire Pendin Clo 335.30.001/3078 Yes, see file Plu d to surface abandonment no data to support proper Uncal #5 Ummt #9 Urrval A66 Umial #T Atiaaru Point#1 U5 US US Na I BL M US Na I BLM USGS/BLM None Pendin Hi h -PCB cleanu Active None Pendia None tPendi Mane Clo 3L5 313.00113079 335.38.00113093 Cao 335.3$.00113080 Clo 335 38 001I3091 None Yes, see file Yes, see file Yes, see file Yes. see lite No Plu ed E4 surface property plugged and abandoned pfupedy plugged and abandoned property plugged and abandoned Need HRR. PA,Plugged by properly plugged and BLM in 2009. abandoned abandonment suriaoe site rcmediated surface site remediated suriacx V le remediated surface site re medialed Page 13 of 14 SPAR Response with Legacy Wells LrsLxlsx Page 14 of 14 0 vrcTon`ce o BLM 2813 Risk Historic AOGCC Subsurface AOGCC Surface Well Name Operator i RP 1 Land Mgr Priority CSP Status File #fFlaxid Releases SPAR Workgroup Notes Status Status Add to Site list. Need HRR, PA. SI with workplan and sampling. Chilling mud assessment. Surface Cleanup. Two large breaches on the south side of the berm allow water out of the reserve pit. Plugged properly plugged and surface site Drew Point #1 USGS 1 BLM None None None Yes by BLM in 2410. abandoned remedialed On Site list Need HRR, PA, 51 with workplan and sampling. [frilling mud assessment. Surface Cleanup. In 1976 the reserve pit berm failed and dolling muds/cutlings were released onlo the Poe of Teshekpuk Lake. Plugged by BLM in 2008. Solid waste from camp aril drilling operations buried on northern portion of pad. Erosion has exposed solid properly plugged and surface site East Teshek uk #1 US Navy 1 BLM None Active - waits 3Q0.38.11012652 Ycs, see file waste. abandoned remediated Threatened by erosion. properly plugged and surface site J. W. Dalton $P USGS f BLM None None None No Plu ed b BLM in 20fl5. abandoned rernediated properly plugged and surface site South Barrow #8 USAF 1 BLM None None None Unknown Need HRR, PA, abandoned remediated properly plugged and surface sile South Bartow 911 US Na INorih Slope Bono None None None Unknown Need HRR, PA, abandoned remedialed properly plugged and surface site South Barrow 013 US Na lNerlh Slope Boro None None None Unknown Need HHR, PA, abandoned remedialed properly plugged and surface site South Barrow #15 US Na !North Sloe Boro None None None Unknown Need HRR, PA, abandoned remediated properly plugged and surface site South Barrow #19 US Na 1Nrarlh Sloe Baro None Nana None Unknown Need HRR. PA, abandoned remediated Properly plugged and surface site South Barrow 1x20 US Na Worth Slope Bora None None None Unknown Need HRR, PA, abandoned remedialed Need HRR, PA, dolling mud assessment, containment assessment, possible releases. Breaches allow wafer to flow into and aul of property plugged and surface site Watakpa #2 USGSI BLM None None lNone lyes I reserve and flare pits. labandoned irernediated Page 14 of 14 0 o>FJ THE STATE 'erTa7t .,ait of L�.�"vLra2mer i:ct OA ASKA Conservation Division of Spill Prevention and Response Contaminated Sites Program GOVERNOR SEAN PARNELL advp, 610 University Ave. ALAS Fairbanks,Alaska 99709-3643 Main:907.451.2181 Fax:907.451.2155 July 11, 2013 Wayne Svejnoha Supervisory Minerals & Energy Specialist 222 W 7th Avenue, #13 sateig) App 0 S `Q�� Anchorage,Alaska 99513 Re: BLM Legacy Wells Dispute Dear Mr. Svejnoha: The Alaska Department of Environmental Conservation (ADEC) —Contaminated Sites has reviewed the National Petroleum Reserve in Alaska: 2013 Legacy Wells Summary Report dated February 2013, containing updated information on the status of the 136 Legacy Wells located in the National Petroleum Reserve— Alaska (NPR-A), and the draft National Petroleum Reserve in Alaska: 2013 Legacy Wells Strategic Plan dated May 2013. ADEC has also reviewed the response by the Alaska Oil and Gas Conservation Commission (AOGC). We concur with the response by AOGC and have no further comment regarding the priorities. We do have comments about the investigation and cleanup plans presented in the report. With this letter we are outlining regulatory requirements related to the environmental work that is proposed and required as part of these cleanups. ADEC is concerned that the 2013 Legacy Wells Strategic Plan prepared by the BLM does not include either assessment or the contingency for assessment of known,likely, or unknown but possible contaminant releases. In addition,BLM plans for surface cleanup of these wells should be made clear in the plan. At least one of these legacy wells has extensive PCB contamination and has resulted in a multi-year cleanup totaling tens of millions of dollars. At others, solid waste disposal practices have resulted in releases to the environment with estimated cleanup costs in the hundreds of millions. Known releases documented in the records we reviewed include crude oil,gasses,refined oil and fuel, drilling fluids that include various organics,metals,and other chemicals, and unknown contaminants from drums and other containers observed to be damaged and abandoned at the various well sites. There are 13 legacy well sites with known releases currently on the DEC contaminated sites list. Many of these are in the process of being addressed, cleaned up, and closed. From our limited records review there are 15 additional legacy well sites with confirmed releases. These should be prioritized for initial records reviews and then added to the BLM contaminated sites list under our cooperative agreement. Suspected releases include fuel releases from operations, storage, and fuel spills at the sites,impacts to various surface water bodies from spilled fluids during drilling and breaches of containment at reserve and flare pits, continued surface runoff from drilling fluids uncontained at several sites, and down-hole substances that were ejected from the holes over time or during blowouts or drilling operations. Wayne Svejnoha 2 July 11, 2013 The BLM plan to address these known, suspected, and unknown releases at legacy well sites is notably absent from the documents presented to date. The three primary regulatory agencies that need to be involved in the plan are ADEC —Contaminated Sites,Alaska Oil& Gas Conservation Commission, and ADEC—EH/Solid Waste. Other agencies will need to be consulted as well. Below we provide recommendations for a coordinated plan using the Uniform Federal Policy for Quality Assurance Project Plans (UFP-QAPP) that will involve all of the regulatory agencies in one coordinated manner. This will allow BLM to address these sites in a consistent and coordinated project which fulfills all of the regulatory requirements so that the sites do not need to be re-visited in the future when they are closed after this project. Attached are our comments on each specific well. The acronyms used on the list include terms that are typically used in a CERCLA type investigation however they are also suitable for investigations conducted under the State of Alaska cleanup rules. These include the following; Historical Records Review (HRR) This is recommended for almost all of the well sites. Much of the information required for these reviews is already contained in various reports and appendices or in BLM files. The Historical Records Review should document the type of releases that might have occurred from drilling operations as well as historical use of the site, and should capture all available information on the drilling fluids used and any product produced or released. Preliminary Assessment (PA) This is recommended for almost all of the well sites. A Preliminary Assessment is a limited scope investigation that provides an assessment of information about a site and its surrounding area to distinguish between sites that pose little or no threat to human health or the environment and sites that require further investigation. The PA is a CERCLA defined document and typically does not require sampling. Site Inspection (SI) If the PA recommends further investigation, then an SI is necessary. The SI is a CERCLA defined document, and it is analogous to an initial report of contamination under state cleanup rules. On some legacy well drillings sites it is evident now that an SI is required just from a review of the reports. An SI investigation typically includes the collection of samples to determine what contaminants are present at the site and whether they are being released into the environment. An approved site specific workplan is required under both CERCLA and 18 AAC 75 prior to SI sampling. The SI typically is not intended to develop a full site characterization,but is limited to determining the presence or absence of a release. If contamination is found after completion of the HRR,PA, and SI then a RI/FS under CERCLA, or a Site Characterization Report and cleanup plan under 18 AAC 75 is required. DEC recommends that BLM incorporate into the strategic plan the processes outlined in this letter. A team of agencies composed of AOGC, DEC-CS,EPA as required,and DEC-EH should address regulatory and technical requirements for these well closures. By cooperating and working together with the regulatory agencies BLM will save time and expense,and regulatory uncertainties will be avoided. The strategic plan should reference a project to prepare a generic workplan. DEC suggests that BLM utilize the generic UFP-QAPP workplan format for the required environmental work. If properly prepared, the workplan could encompass most of the investigations and cleanups required at these sites over multiple years. At other multi-site projects we have found this to be an effective way to reduce uncertainties and risk in these types of investigations. A very small site specific FSP could then be developed as BLM approaches each drilling site. Regulatory decisions made during workplan development would provide more certainty in the planning process for cleanups. (.\cr)ARFpAp"1 AoP.,ripe\noT\BJ.M\Proiects\Leaacv Wells\711 13 Letter to BLM on Legacy Wells.docx Wayne Svejnoha 3 July 11, 2013 Please review the attached list of specific sites. if you have any questions, please do not hesitate to call me at 907-451-2181 or by email at fred.vreeman@alaska.gov. I look forward to working with you as the Federal Government fulfills its requirement to clean up these well drilling sites in Alaska. Sincerely, Fred Vreeman Environmental Program Manager Enclosure: SPAR Response with Legacy Wells cc: Bud Cribley, State Director, Bureau of Land Management Steven Cohn, Deputy State Director for Resources, Bureau of Land Management Jolie Pollet, Branch Chief, Bureau of Land Management Robert Brumbaugh, Geologist, Bureau of Land Management Michael McCrum, Environmental Engineer,Bureau of Land Management Cathy Foerster, Commissioner, Alaska Oil and Gas Conservation Commission Larry Hartig, Commissioner,Alaska Department of Environmental Conservation Kristen Ryan, Director,ADEC Division of Spill Prevention and Response Steve Bainbridge, Program Manager,ADEC Contaminated Sites Program Jennifer Roberts, Program Manager,ADEC Contaminated Sites Program G:\SPAR\CS\Federal Facilities\Civilian Federal Agencies\DOI\BLM\Projects\Legacy Wells\7 11 13 Letter to BLM on Legacy Wells.docx - - ' m I 2 U m >,—. m -0 -0 t o N i m m 7 N N m N = '0 m U a�o CO N m m co co co co co co m CO m m m m m m m -C m O io m m m m m m m .6 o) m 6. co io m TO co co co C)w m e O « 'O 'O 'O I] m -o -o 'O 'O -o 'O •o -o 'O m 0 0 0 0 0 0 0 o a) > 0 0 0 0 0 0 0 0 0 > co o Q (1) C C C c C C C C O N C C C C C C C C C 13 0 Z N a) a) m a) T-C a) m m m a) m a) a) N O 1 m o 0 0 0 a i m o 0 0 0 0 o a o o = U L L L t L L L L L .0 L .0 - C C C C C Y 'm0 C C C C C C C C L U 7 a= a= �' > N a= a= a= N O CO N m m m O .N J m N N d m m m m N U N t .0 O N N N N O• C m N N N N N N N N N O 'CON CO O o O L O o O O '0 o '0 'o '0 E 0 p O 7 5 7 O O `° 7 0 7 5 > > 5 7 7 E Z V U N :° @ c c a) o U 3 c COo co CO CO CO CO m 0 '0 < Cl) c c o a 0 3 m C) o 0 °c o `o C. a 0- > -.--' n- C N m 0 ryry m - o z I� ° .o m .° m -0 N -° CC -o C - m -O ',- -0 '° 0:1 CC -o CO C -o CO -o C ,° COC -o COC0) O) Z a — n - a - a n - o ° m a'- a - a - o- o. - o-•- a a Q I; a G= Y C G= C= _ C Y C 3 N Y G Y Y C Y C Y a 7 U) (1) — 0 — 0 — O _ O O - O - a) O - O = O = O (n = 0 - O - O O N C O g Q Q-0 Ttr 3 -`0 3 -0 3 - 3 -0 3 a 3 aC) v) -0 3 •`0 3 -0 3 -`0 3 Q-0 3 -0 3 a 3 -0 3 Q -c ,L ° m I �)'a a . 06 o() .6 .t6 .6 ' E m 06 D . 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Abreak-down of the 136 is as follows: • 39 are uncased core holes that did not penetrate oil and gas zone, have naturally collapsed, and have blended harmlessly into the landscape. • 33 were either transferred to the North Slope Borough through the Barrow Gas Field Act of 1984 or were conveyed to Arctic Slope Regional Corporation. • 20 wells are being used to by the United States Geological Survey (USGS) for climatic temperature and perniafrost studies (see Appendix B). • 7 wells are plugged (6 at Umiat, Square Lake #1). • 37 wells that require further evaluation. Following the 2003 field season, members of the legacy well team met to determine criteria for evaluating the risks associated with the above mentioned 37 wells and ranking each well based on these risks. For consistency purposes, the group devised a series of questions to assist in the process: • What is the condition of the existing pad and pits? (e.g. any indication of contamination?) • Is there any solid waste (old equipment, piping, barrels, etc.) or potential hazardous material conditions? • Did the hole penetrate known oil or gas stratigraphy? • Did the well have oil or gas shows, and if so, is the well capable of flowing? • Is the well near human activity, and if so are there conditions present that pose a risk to people? • What is the condition of the wellhead? Have there been any previous problems or repair work? Does the well (in its current condition) pose a risk? • What is the surficial condition of the existing pad and pits? Is contamination a possibility? • Does the presence of unplugged wells have the potential to negatively impact anticipated development? Each of the 37 wells are described in the following pages. Descriptions are ordered in terms of the ranked priority based on the above stated criteria and the concerns identified. Umiat Wells The early Navy wells in Umiat rank at the top of the list. Umiat is located on the north bank of the Colville River 60 miles upstream from the village of Nuiqsut. Natural oil seeps were discovered at Umiat by early explorers. This discovery, along with the detection of seeps at Cape Simpson, motivated the U.S. Navy to conduct a drilling program. Umiat and the Simpson Peninsula were the primary exploration targets in the mid to late 1940s. The Umiat seeps are still visible today. Their locations tend to shift over time. The seeps are currently active in Umiat Lake, just off the northeast portion of the airstrip and in a channel of the Colville River. ~ ~~ 22 ~~~ The 11 Umiat wells were drilled from 1945 to 1952. These wells are a concern for BLM due to their close proximity to human activity. Umiat is not a village, but serves as a camp for seismic crews: Umiat is also the primary hub for recreational activities in eastern NPR-A and western CAMA (Central Arctic Management Area). It has one of the few airstrips on the North Slope maintained year-round and is a popular location for purchasing aircraft fuel (Figure 10). The Unuat wells all lie within 2 miles of the camp, with the exception of Umiat #1, which is approximately 5 miles to the northwest. After the U. S. Navy completed drilling operations in 1952, the U. S. Air Force assumed custodial responsibility at Umiat and established the 8,000-acre Umiat Air Force Station. In Tune of aircraft. 1955 the Air Force returned the facility to the U.S. Navy. Since Umiat is a Formerly Used Defense Site (FUDS), the U.S. Army Corp of Engineers (COE) is responsible for the reduction of risk associated with surficial hazardous, toxic, and radioactive waste. The COE has conducted extensive surface investigations in the area and has identified contaminants at several locations. Varying levels of barium, petroleum, pesticides, and polychlorinated biphenyl (PCB) were identified at the wellsites, the landfill, and the nearby slough (U.S. Arnry COE, 2003). Contamination levels were compared to the Alaska Department of Environmental cleanup standards and were used as a screening level. The COE has conducted site remediation at two well locations, Umiat #2 and #5 (Figure 11), and has plans to continue the surface clean up. To facilitate site remediation, the COE plugged wells #2 and #5 in 2002, but plugging the remainder of the wells is the responsibility of the BLM. Four wells were plugged by the BLM in the Winter/Spring of 2004. After the removal of wellheads #2 and #5, the State of Alaska Historic Preservation Office asked the BLM to leave all existing surface objects (wellheads, tanks, pipes) onsite and intact, because of their potential Figure 11: Umiat #2 and #5 prior to removal and historic value. The Alaska Heritage remediation. Photo taken August 2001. Resources Survey (AHRS) included the Umiat wells in an inventory of all reported historic and prehistoric sites within the State of Alaska. This inventory of cultural resources includes objects, structures, buildings, sites, districts, and travel routes generally more than 50 years old. Therefore, the wellheads for the other Umiat wells will be left in place after plugging is completed. 23 Umiat #9 Umiat #9 was spudded in June 1951 and completed seven months later in January 1952. The well is cased to a depth of 1,257 feet. The purpose of the well was to determine the western extent of the producing field. It was also the first hole in which oil-based muds were used in the Umiat area. Umiat #9 is located about half mile to the north-northwest of the Seabee pad. The well is located within the Northeast planning boundary (see Map 2) on lease AA- 081726. There is some potential for future development to occur in the area within the next 20 years and the well has the potential to leak to surface if development occurs and may adversely affect future development. Surficial wastes around Umiat #9 could present an issue. As was common with early Navy drilling, a gravel pad was not created. Wooden debris exists around the wellhead and there is a pile of drilling muds directly to the north which is void of vegetation (Figure 12). Samples taken by the COE from around the wellhead detected elevated levels of diesel range organics (DRO), residual range organics (RRO) and PCBs (U.S. Army COE, 2003). 24 The wellhead is equipped with two bull plugs, a flange and a 2 '/-inch nipple. There are no fresh water aquifers in the area, but due to potential contaminants downhole and existing contaminants on the surface, the well does pose a risk to human health and the environment in its current condition. Umiat #6 Umiat #6 was spudded August 1950 to test the southern limits of the Umiat anticline. The hole was drilled to a depth of 825 feet. The well was cased to 35 feet and a 42-foot cement plug was placed on the bottom of the well in order to stop water influx fioin sands at the base of the permafrost. The well encountered very poor shows in the Killik Tongue (Chandler Formation) and a productive sand in the upper Grandstand Formation. Oil recovered in open-hole pumping tests was produced at rates averaging 53 barrels of oil per day. Insufficient energy exists in the reservoir for the well to flow to surface and there are no fresh water aquifers present. Major caving of the hole occurred and the well was backfilled with mud (Robinson and Bergquist, 1956). The well is located within the Northeast planning boundary (see Map 2) on lease AA- 081726. There is some potential for future development to occur in the area within the next 20 years and the well has the potential to leak to surface if development occurs and may adversely affect future development. The well lies about 500 feet to the northwest of a gravel spur road which connects the Colville River to the eastern edge of the Umiat airstrip. The well is located in wet tundra adjacent to an empty 55-gallon drum. The well is left open with 8 '/8-inch casing to the surface. It has no gauges, valves or a cover plate. Two theimistor protrude to the surface and rests on the lip of the casing. This well poses no threat to human health or the environment unless development occurs. Umiat #7 Umiat #7 was drilled in 1951 to a depth of 1,384 feet, cased to 1,196 feet and completed as a dry r' hole. It was the southern ~ ~ most well drilled on the ' '~"~ Umiat anticline. The ~ objective was to further delineate the southern extent of the producing Figure 13: Umiat #7 summer and winter photos. field. The well encountered residual hydrocarbons in the Chandler and Grandstand formations. Oil recovered in bailing tests was so minute that it was measured in gallons. The small amount of crude recovered in each test is indicative of residual oil staining. The sands encountered in Grandstand are downdip of the productive reservoir and are water bearing. Minor gas shows were encountered at 260 feet (Robinson and Bergquist, 1956). The well is located within the Northeast planning boundary (see Map 2} on lease AA- 081726. There is some potential for future development to occur in the area within the 25 next 20 years but since the well is located below the oil/water contact it has less potential to be adversely affected or affect future development. The wellhead assembly consists of 7-inch casing (with collar) clamped inside 11 3/-inch casing at a total height of 30 inches (Figure 13). Sui7•ounding the open hole is wet tundra with no indication of remaining debris or other surficial issues. The hole poses no tlueat to humans or the environment. The well location is cun•ently situated on Alaska Dept. of Transportation land that was transferred in 1966, but the well remains the property of the BLM. Additional Uiniat Work Umiat has been a site of recent cleanup projects. The cleanup process began in 1994 with the removal of about 1,000 drums, some containing petroleum and transformer oil with PCBs, from the main gravel pad. Another 200 cubic yards of PCB-contaminated soil was removed in 1998 along with 60 cubic yards of lead-contaminated soils. In 2001, 50 cubic yards of PCB soil was excavated with an additional 10 cubic yards removed the following year by the Corps of Engineers (U.S. COE, 2003). J.W. Dalton #1 J.W. Dalton #1 was drilled in 1979 to a depth of 9,367 feet. It is cased down to 8,898 feet and plugged back to 1,530 feet. (Husky Oil NPR Operations for U.S. Geological Survey-J.W. Dalton, 1982). The primary objective of the well was to determine if hydrocarbons were present within the Sadlerochit and Lisburne Groups. Gas shows were encountered in trace amounts in the Ivishak Formation, and the Lisburne and Endicott Group. Poor to good oil shows were discovered in the Ivishak Formation and in the Lisburne Group. A drillstem test of the Lisburne Group recovered 22 barrels of oily water (Gyrc, 1988). This well has been a USGS monitor well since its completion in 1979. Approximately 230 barrels of diesel fuel were placed downhole to act as a neutral medium for collecting wellbore temperatures. In the summer of 2004, wanner temperatures, wind, and wave action eroded 200 feet of the coastline adjacent to the well (Figures 14, 15). This erosion placed the J.W. Dalton # 1 well and reserve pit precariously close ~:~~ ~ - ,`~ ,:_ ~~ ~j~, Figure 14: Photo of J.W. Dalton taken October 26, 2004. Soil cracking is occurring around the wellhead and the north and east side of the cellar is exposed. 26 Figure 15: J.W. Dalton wellhead with pilings. Photo was taken August 2000. to the edge of the Arctic Ocean. As a result, casing is now exposed to a depth of 15 feet on the present day beach (Figure 16}. The top of the diesel is approximately 60 feet below the present beach level. The reserve pit has been breached on the northwest coiner from the advancing shoreline (Figure 17). The pit is known to contain chromium, cobalt, zinc, and barium. However, chromium, cobalt and zinc were detected in background levels, due to the east-west water movement into and out of the pit. Barium is a constituent of the drilling muds and is consolidated with other sediments (U.S. Bureau of Land Management, U.S. Geological Survey, 1992) The well is located within the Northeast planning area (see Map 2), on a tract cun-ently closed to leasing. _ ` 7 ,~ ~ ~ -. -V,.,~ This well is in danger of ~' ~, ~- ~ # ..~=~ ~ ~ becoming engulfed by the ocean. _ _ _ •-= '~~~ ~ Th di l f l i h ,:M.~.,-.~ r ' ~r ~,, ~ ., ~ e ese ue n t e well and '` ~ °~"~ ''~"`~ ~ ~ `~ •4 ~,~,~ ~ , reserve pit contaminants raises ..~ ~; , - „~;__•, ~'~"'~: - concerns. The concerns can be rx4 ~ ~ ~ ' ~ `~'~ ~~;~ T ~~ eliminated by pumping out the ~ ~,< .tH _~ • ¢ ~ diesel, or displacing the diesel ~ ,, i f ~ r ,,y , ~ ,~. ~~ with water and adding a bridge _ .;~,: lu and cement to close f o f the P g 'E c:. - ~ 4 p hole. The casing would be cut off 2 ,~ . ~`~~~''~~ ~ ~ ~ ~ ~ below surface. The diesel would be disposed of at the nearest Figure 17: Aerial view of the breached reserve pit. facility. If necessary, the reserve pit could be excavated down to remove contaminated soils, which would be placed into Super-Sacks and hauled out by Cat-Train for grinding and injection into a Class II well or other approved disposal site. In its cunent condition, the well does not pose a threat to humans or the environment, but if the casing were to break in its exposed condition, the diesel fuel would, over time, leak into the ocean. The release of heavy metals from the reserve pit may pose an irmnediate risk to human health and the environment. The pit was sampled October 26, 2004, and results are pending. 27 Figure 16: J.W. Dalton with exposed conductor (left), and rat hole (right). The mouse hole (not pictured) is completely exposed. Figure 18: Simpson Peninsula showing well locations. Simpson Core Test #26 Simpson Core Test #26 was drilled in the middle of one of the larger, active oil seeps in NPR-A (Figure 19). The Navy described this location as Seep 3. The hole reached a total depth of 1,171 feet and was cased to 350 feet. The well encountered one very poor gas show and one productive oil sand in the Ninuluk/Seabee undifferentiated formation. In production tests, the well flowed at rates averaging 110 barrels of oil per day (Robinson and Brewer, 1964). Other formations encountered include the Gubik, Seabee, and Grandstand Formations. Gas bubbles have been observed around the base of the casing since the 2000 field season. Bob Burruss of the USGS, sampled and analyzed gas from Simpson Core #27 which is part of the same oil field, located less than half mile to the east. His findings showed the gas to be biogenic methane indicating that microbial alteration (breakdowns) of the hydrocarbons has generated the gas. Additionally, oil sampled in the well was extremely biodegraded. Simpson Figure 19: The wellhead is located in the center of Core #26 has a wellhead flanged to the the photo. The green color liquid defines the area of active seepage. The orange color is oil-eating casing, a 2-inch line pipe, and four bacteria. wing valves and will likely flow oil if 28 the valves are opened. Access to the wellhead is limited by the depth of oily-water surrounding its base (Figure 20). There are no concerns with contaminating fresh water aquifers if the well is left unplugged, but the well could potentially flow oil and cause damage to surface resources if the well equipment con•odes or, through human intervention, the well is opened or damaged. The well is located within the Northwest planning boundary (see Map 2). The tract was recently leased, receiving a high bid of $7.51 per acre during the NW NPR-A lease sale of 2004. Exploration and development is a distinct possibility within the next 20 years but it is unlikely this well will have an adverse impact on development since any development will likely target deeper, more productive formations. The area around the wellhead looks to have been bulldozed in an attempt to collect the seeping Figure 20: Simpson Core #26 drilled in the middle of an oil. The scraped-up earth was oil seep. Depth of the oily-water prohibits access to the then used to build berms around Wellhead. the depression. Light amounts of trash appear to have been buried in these berms. The Navy cleaned up the site in the late 70s, removing most of the drums and other debris, but solid wastes, including half barrels and other drums can be found in the wet tar that fills the depression. Simpson Core Test #31 Simpson Core Test #31 is a shallow core test drilled in 1951 to a depth of 355 feet and cased to 101 feet. The objective of drilling was to collect a core to view the material at the bottom of the seep. The well does not meet standard oil and gas exploration well definitions. The casing is not cemented in place and the well is probably not capable of holding substantial pressure. The well encountered a few sands with shows and one productive sand in the Ninuluk/Seabee undifferentiated formation. In 65 hours of testing, this zone flowed oil to the surface at rates averaging 125 barrels and 2,000- Figure Zl: Simpson Core #31 is located within an 4,000 cubic feet of gas per day. active oil seep. Flowing pressure was measured at 60 29 psi. The well also penetrated the Gubik and Seabee Fornlations, which were unproductive (Robinson and Brewer, 1964). The well is located within the Northwest planning boundary (see Map 2). The tract was recently leased and received a high bid of $7.51 per acre during the NW NPR-A lease sale of 2004. Exploration and development is a distinct possibility within the next 20 years but it is unlikely this well will have an adverse impact on development since any development will likely target deeper, more productive formations. A drilling pad does not exist as the well was drilled in an active oil seep, which remains active today (Figure 21). The Simpson Peninsula contains few permanent settlements, but a multitude of sununer camps. The well had been a source of fuel for the inhabitants as evidenced by a 10-foot extension pipe hooked up to the wing valve. The extension allowed for the oil to flow down the pipe and collect in a bucket. In 2000, BLM learned that oil was seeping out of a corroded swedge on the wellhead. The potential harm was mitigated by the fact oil was seeping into a natural oil seep. In June 2001, BLM spent $35,000 to remove the old wellhead and install a new master valve and needle valve. Oil and gas samples were taken by the USGS prior to the replacement. There are no fresh water aquifers in the well so there .are no risks to sub-surface resources but there are risks to surface resources if the well is left unplugged. Oil will flow to surface if the wellhead or casing con•odes or if the well is left open. There are no solid wastes or hazardous materials (besides the natural oil) that would present a concern or pose a risk to the health and safety of the land and people. Simpson Core Test #30A Simpson Core Test #30A is an oil well drilled in 1951 to a depth of 693 feet and cased to 152 feet. The well encountered some very poor gas shows and one productive sand in the Ninuluk/Seabee undifferentiated formation. The well was bailed and averaged oil rates of 6 barrels per day during bailing tests (Robinson and Brewer, 1964). The well is located within the Northwest planning boundary (see Map 2). The tract was recently leased and received a high bid of $7.51 per acre during the NW NPR-A lease sale of 2004. Exploration and development is a distinct possibility within the next 20 years but it is unlikely this well will have an adverse impact on development since any development will likely target deeper, more productive formations. The wellhead consists of casing swedge, a nipple, and a brass gate valve and will flow oil to surface if the valve is opened. There are no sub-surface fresh water aquifers at risk. However, if the well is left unplugged it could pose a risk to surface resources. In its cun-ent state, oil could flow to surface if the well is damaged, corroded, or the valves are opened. Additionally, concerns have been raised regarding the bubbling around the base of the casing. When the valve is opened, the bubbling subsides. This indicates a small leak around the base of the casing or through a hole in the casing. The gas was sampled by the USGS and has been identified as reservoir-produced biogenic gas. While the well does pose a risk, it is mitigated by the fact that the well is drilled in an active, natural oil seep. 30 Simpson Core Test #30 Simpson Core Tests #30 and #30A were drilled about 100 feet apart in the same oil seep. The seep is part of the same regime that contains Cores #26 and #27. These wells were drilled to gain an understanding of the producing field limits and to help determine underlying structure. Simpson Core #30 is an oil well drilled in 1951 to a depth of 1,500 feet. No plugs were set and the well was cased to 102 ft. The hole encountered the same formations as Cores #26 and #27; Gubik, Seabee, undifferentiated Ninuluk/Seabee, and the Grandstand with a few poor gas shows and one productive sand in the Ninuluk/Seabee undifferentiated formation. Poor oil shows were also noted in the deeper Grandstand Formation. During production tests of the shallow oil sand the well was bailed at rates averaging 5 barrels of oil per day (Robinson and Brewer, 1964). The well is located within the Northwest planning boundary (see Map 2). The tract was recently leased and received a high bid of X7.51 per acre during the NW NPR-A lease sale of 2004. Exploration and development is a distinct possibility within the next 20 years but it is unlikely this well will have an adverse impact on development since any development will likely target deeper, more productive formations. The well was left with sheared, open casing above ground. Even though the well produced oil 50 years ago, it is static today. This suggests the hole has collapsed below the shallow casing. There are no fresh water aquifers in the well, however, since the well was drilled to a reservoir with sufficient energy to flow oil to surface, the well should probably be considered a risk if left unplugged. This well would probably be plugged by placing a 100 foot surface plug downhole to eliminate risks to surface resources. The potential risk is alleviated by the fact that the well is drilled in an active, natural oil seep. There is no drill pad as the Navy drilled within the seep and camped on the tundra. Some light trash is present in the seep between the Core #30 and Core #30A, which may prove difficult to clean (Figure 22). The well lies three tenths of a mile from both Core #26 and #27 (Figure 18). Simpson Core Test #27 Simpson Core Test #27 is an oil well that was spudded February 1951 and completed one month later. Total depth of the well is 1,500 feet, with casing down to 102 feet. Oil was encountered at a depth of 380 feet and was bailed at a rate of 3 barrels per day. The core test encountered the same formations as Simpson Core Test #26, with a few very poor gas shows and one productive oil bearing sand in the Ninuluk/Seabee undifferentiated formation. Oil-based muds were used from the drilling depth of 325 to 661 feet. At that point the oil was displaced and the drilling crew resumed using water based muds. 31 Figure 22: Light trash is present in the seep between Cores #30 and #30A. Additional crude was added downhole at a depth of 1,320 feet. The drill pipe was stuck and the two front derrick legs collapsed below the four-foot extension in an effort to free the pipe. The drilling muds in place were re-circulated during the repair process. In an attempt to free the pipe, 73 barrels of crude and 23 barrels of diesel were used to replace the muds and the pipe was worked free. The oil was gradually replaced by mud as the drilling continued, however, some oil remained in the hole after completion. The crude used downhole came from Simpson Core Test #26 (Robinson and Brewer, 1964). There are no fresh water aquifers in the well so there are no risks to sub-surface resources but there are risks to surface resources if the well is left unplugged. Oil could flow to surface if the well equipment corrodes, the well is damaged, or left open. This potential risk is mitigated by the fact that the well is drilled in an inactive, natural oil seep. The well is located within the Northwest planning boundary (see Map 2). The tract was recently leased and received a high bid of $7.51 per acre during the NW NPR-A lease sale of 2004. Exploration and development is a distinct possibility within the next 20 years but it is unlikely this well will have an adverse impact on development since any development will likely target deeper, more productive formations. There is no existing pad. The wellhead consists of 8 5/8-inch casing, a flange and a brass gate valve. The casing was set in a small inactive oil seep. It will flow oil to surface if opened. There is no surface debris present at Core #27 (Figure 23). The well poses little threat to human health and the immediate environment around it in its current condition. Simpson Core Test #29 Simpson Core Test #29 is a dry hole drilled in 1950 to a depth of 700 feet and cased to 152 feet. The purpose of the well was to determine the limits of the producing field encountered at Core #26. A very poor oil show was identified in the Seabee Formation. The productive sand present in the other Simpson Cores does not exist in this well. The test hole also penetrated the Gubik and Grandstand Formations. No oil was recovered from this well (Robinson and Brewer, 1964). The well is grouped higher on the priority list due to its close approximation to Simpson Cores #26, #27, #30 and #30A (Figure 18). The well is located within the Northwest planning boundary (see Map 2). The tract was recently leased and received a high bid of $7.51 per acre during the NW NPR-A lease sale of 2004. Exploration and development is a distinct possibility within the next 20 years but it is unlikely this well will have an adverse impact on development if left unplugged since any development will likely target deeper, more productive formations. The well was left with 8 '/2-inch casing, open to the atmosphere at a height of 6 inches. Thermistor cables protrude from the casing. It is located in a four-by-four foot wooden 32 Figure 23: There is no surface debris present at Simpson Core #27. cellar filled with water. A drilling pad was never established. There is some light trash around the wellhead including drill pipe, and various sized wooden scraps. A small barrel pump and other small debris can be seen in the casing and within the cellar (Figure 24). This well poses no threat to the human population or the environment. Umiat #1 .i',i ~~ r ;; ,_~~ , t: ti =~ ~~-_ _ , Figure 24: Simpson Core #29 - ,, } Umiat #1 was spud in 1945, and completed in 1946. Total depth reached was 6,005 feet and the well was cased to 685 feet. The well encountered residual hydrocarbons and a few poor gas shows in the Seabee, Ninuluk, Chandler, Grandstand, and Topagoruk Formations. The sands of the Grandstand were outside the productive area encountered by other Umiat wells, which are located five miles to the east. Oil recovered in bailing tests was so minute that it was measured in pints and officially recorded as a trace. Lab tests determined the oil to be of a different type of crude oil than that found in the productive Umiat wells (Robinson and Bergquist, 1956). The small amount of crude recovered in each test is indicative of residual oil staining. No fresh water aquifers exist in the Umiat area, so this well poses no threat to sub-surface water resources. There is no pressw•e on the wellhead and it is fitted with a blind plate, a 2-inch nipple and a brass gate valve (Figure 25). The well is located on an unleased tract at the crest of a hill that divides the north and south forks of Seabee Creek. Future development is unlikely because of its location outside the Umiat structure. Left unplugged, the well poses no threat to the environment and has no potential to advez'sely affect future development. 33 indication of stressed vegetation down-gradient from the drill muds. Additionally, solid waste in the foi7n of steel framing and scrap metal are near the wellhead. The solid wastes pose no threat but are unsightly. Umiat #11 Umiat #11 was spud June 1952 and completed two months later. The well reached a total depth of 3,303 feet with 486 feet cased. One cement plug was placed at 440 feet. The objective was to test production possibilities of the Grandstand Formation on a fault that parallels the Umiat anticline. The well encountered residual hydrocarbons in the Seabee, Ninuluk, and Grandstand Formations but no oil or gas was recovered during production tests. The sands of the Grandstand were outside the productive area encountered by other Umiat wells, which are over one mile to the south. The well is located within the Northeast planning boundary (see Map 2). The tract is located on lease AA-084141 but there is little possibility of the well interfering with future development due to its location outside the Umiat structure. The well was drilled in the alluvial plain of Bearpaw Creek, 0.6 miles from Umiat #8. A drilling pad was never created as operations consisted of mounting the drill rig on a sled and then placing it on top of large timbers that were secured to pilings (Robinson and Bergquist, 1956). A pile of unvegetated drilling muds is present 30 feet west of the wellhead in between the wellhead and the creek. The wellhead consists of a 10 3/4-inch open-ended casing with a collar sticking up inside a 30-inch conductor that is filled with water. Minor wood debris can be found around the wellhead. The well poses no risk if left unplugged. Wolf Creek Area Three test wells were drilled in the Wolf Creek area. The wells were drilled in the early 1950s with the intent of testing the northwest-trending Wolf Creek anticline structure. Wolf Creek #1 and #3 (Figure 26) are located at the crest of a hill with about 250 feet of relief from the valley. Wolf Creek #2 is located about one and one- third miles north within the Wolf Creek valley. Wolf Creek #2 and #3 are open holes but Wolf Creek #1 is equipped with a wellhead. ~ ~.. ~. ,~,~~' ,~ ~'~ .~ ~. ~ a;,~ :,~ ~~~ Figure 26: Wolf Creek #1 after adding a new ball valve to the wellhead. August 2004. ~,.,.~ ~,,y:~. _ , .. ~~ n ~:~, .-,t:r~..... Wolf Creek #1 Wolf Creek #1 is a gas well drilled in 1951 to 1,500 feet and cased to 48 feet. The well encountered very poor gas shows in the Killik Tongue and productive sands in the Grandstand Formation. The well produced at rates up to 881 MCFPD in open hole tests 34 of the Grandstand. The well is equipped with a blind plate, a 2-inch nipple and a brass gate valve (Figure 26). There is a small gas leak in the threaded wellhead flange and, if the valve is opened, the well will flow about 10 MCFPD but the pressure is so low it does not register on a gauge. In its current condition, the well does not appear to pose a risk to surface or sub- surface resources. The drill pad is shared with Wolf Creek #3. Tlu-oughout the pad, there are some wooden pilings, metal anchors and scrap metal. The scraps should not be considered hazardous in this remote region. The leaking gas is of minor concern, however given the weak gas pressure and remote location; the overall risk is very minimal. Wolf Creek #2 Wolf Creek #2 is a dry hole. The well was drilled in 1951 to 1,618 feet and cased to 53 feet. It is located roughly 1 ~/ miles north of the other Wolf Creek test wells. The purpose of drilling was to determine if the gas-bearing sandstone beds previously encountered in Wolf Creek #1 would contain any oil. The records indicate a very poor gas show was encountered in the Killik Tongue but no oil or gas was recovered in production tests (Collins and Bergquist, 199). The hole also penetrated the Seabee, Ninuluk, Chandler, and Grandstand Formations. The well is located on an unleased tract within the Northwest planning area (see Map 2). No offers were received in the June 2004 lease sale for the tract and near-term development is unlikely. The wellhead consists of a plate welded onto the 11 3/-inch casing cut off at ground level (Figure 27). There is no existing drill pad. Solid wastes consist of a few empty 55-gallon drums upstream along the upper floodplain of the creek. The well poses no threat to surface or sub-surface resources and has no potential to adversely affect future development. Wolf Creek #3 Wolf Creek #3 is a gas well. The well was drilled in 192 to a depth of 3,760 feet and cased to 625 feet. It is deeper than the other two Wolf Creek wells because its primary purpose was to test the Grandstand Formation (the producing formation around Umiat, 35 miles to the west). The Grandstand Formation produced from four different sands. In 35 Figure 27: Wolf Creek #2 had casing cut off at ground level. open hole flow tests of the well produced at rates up to 445 MCFPD. The gas appeared to be sufficient to supply a small camp, but not of commercial proportions (Collins and Bergquist, 1959). Two plugs were set in the well above the Grandstand Formation. The top of the shallowest plug is inside the casing at 554 feet. In addition to the Grandstand, the hole penetrated the Ninuluk, Chandler, and Topagoruk Formations. Upon abandonment, the hole was filled with oil-based drilling muds and left open to the envirorunent. A total of 103 barrels of crude were used. The well is located on an unleased tract within the Northwest planning area (see Map 2). No offers were received in the .Tune 2004 lease sale for the tract and near-term development is unlikely. The well poses no tlueat to surface or sub-surface resources and has no potential to adversely affect future development. The drill pad is shared with Wolf Creek #1. There is some minor debris at the site as noted in the Wolf Creek #1 description. The wellhead was cut off six inches from the ground surface. This allows seasonal precipitation to accrue in the hole and spill over the sides, but the well poses no threat to surface or sub-surface resources and has no potential to adversely affect future development. Fish Creek #1 Fish Creek #1 was drilled by the Navy in 1949 near an oil seep. Total depth of the well was 7,020 feet. The well was plugged back to approximately 2,550 feet, drilled to a new total depth of 3,018 feet and cased to 3,017 feet. The well was drilled to test a large gravity anomaly that suggested the possible presence of petroleum-bearing rocks and some structural anomaly that might be a trap for oil. Very poor oil shows were identified in the Topagoiuk Formation at depths from 5,550 - 6,000 feet and a productive sand was reported at 3,000 feet. The well is not a flowing well but was pump-tested at rates averaging 12 ban•els of oil per day through agravel-packed completion. It also produced a small amount of methane gas. The hole encountered the Gubik, Shrader Bluff, Tuluvak, and Seabee Formations. 36 producing by 2008. Given the low level of risk, the plugging of this well should be postponed until infrastructure is established. Surficially, there are still some solid wastes present. The drilling pad and cellar construction consists of concrete reinforced with steel matting. The concrete, matting, and pilings are still in place today, albeit heaved by permafrost (Figure 28). Several 55- gallon trash drums filled with debris are located off the concrete pad. Other light debris is also present within 500 feet of the pad. The oil seep is located about 1.5 miles to the southwest of the well site and is inactive. The USGS 305-I reports the dimension of the seep as being 6' x 20' (Florence and Brewer, 1964), however, BLM personnel located the seep in 2001 and noted its dimension to be 3' x 6'. Simpson Core Test #28 Simpson Core Test #28 was drilled in September 1950 to a total depth of 2,505 feet and cased to 110 feet. Despite the depth, the hole did not encounter any hydrocarbon shows. The well is located within the Northwest planning area (see Map 2) on a recently leased tract that received a high bid of $21.51 per acre during the lease sale of 2004. Exploration and development is a distinct possibility within the next 20 years but it is unlikely this well will have an adverse impact on development since the well did not penetrate productive zones and future development will likely target deeper, more productive formations. A drill pad does not exist, however a large area of disturbance is visible. The wellhead consists of open casing inside a wooden cellar. There is considerable solid waste near the well. These include: numerous metal pilings, drill pipe, large wood fragments (spool, plywood, timbers), and some partially crushed drums. The solid wastes are unsightly, but pose no threat to humans or the environment. Simpson Core Test #13 Simpson Core Test #13 was drilled in the summer of 1949. It was a relatively shallow test and did not generate any significant oil or gas shows. The well encountered residual hydrocarbons in the Seabee and Grandstand Formations at depths of 1,079 - 1,084 and 1,138 - 1,148 feet (Robinson and Brewer, 1964). No oil or gas was recovered during production tests. The well is over three miles north of the Simpson Core wells that penetrated productive Grandstand sands. Total depth of the well reached 1,438 feet. The top 26 feet are cased and the hole was filled with water-based drilling mud. Fresh water aquifers were not encountered. The well is located within the Northwest planning area (see Map 2) on a recently leased tract that received a high bid of $21.51 per acre during the lease sale of 2004. Exploration and development is a distinct possibility within the next 20 years but it is unlikely this well will have an adverse impact on development since the well did not penetrate productive zones and future development will likely target deeper, more productive formations. 37 A drilling pad does not exist. Seven-inch casing was cut off at ground level and is very difficult to locate. The well is open to the atmosphere. There is no solid waste, nor is there anything hazardous regarding this location. It should not be considered a risk to surface or sub-surface resources. Simpson Core Test #15 Simpson Core Test #15 was drilled in August 1949 near an active oil seep. The well was drilled to a total depth of 900 feet and cased to 18 feet. The well encountered only residual hydrocarbons in the Ninuluk/Seabee and Grandstand Formations (Robinson and Brewer, 1964). No oil or gas was recovered during well tests. Additionally, fresh water aquifers were not encountered. ~"N , 'C~r 3 L Y F 1~ r ~•~y~~ii~ ~ YY' TlRTN C _~4 Figure 29: Simpson atmosphere. The well is located within the Northwest planning area (see Map 2) on a recently leased tract that received a high bid of $21.51 per acre during the lease sale of 2004. Exploration and development is a distinct possibility within the next 20 years but it is unlikely this well will have an adverse impact on development since the well did not penetrate productive zones and future development will likely target deeper, more productive formations. There is no existing pad. The well was drilled about `/s of a mile not-th of a natural seep. The well consists of open ended casing with a height of 18 inches (Figure 29). The area is clean with no solid waste. This well poses no risks to the environment or human activities. Simpson Core Test #14 Simpson Core Test #14 was drilled in 1949 to a depth of 290 feet. The records do not clearly state how much casing was run but the well was left with casing above ground open to the atmosphere. Its present day location lies within 1000 feet to the west of an active oil seep. The well was not drilled deep enough to encounter the hydrocarbon stained sands evident in the Simpson Core #14A well. The well is located within the Northwest planning area (see Map 2) on a recently leased tract that received a high bid of $21.51 per acre during the lease sale of 2004. Exploration and development in the area is a distinct possibility within the next 20 years. This shallow well did not penetrate any hydrocarbon bearing zones and poses no risk to surface or sub- surface resources, nor does it have the potential to adversely impact future development. 38 Simpson Core Test #14A Simpson Core #14A was drilled in 1949 to a depth of 1,270 feet and casing was set to a depth of 32 feet. The well encountered only residual hydrocarbons in the Ninuluk/Seabee and Grandstand Formations. No oil or gas was recovered during tests (Robinson and Brewer, 1964) and fresh water aquifers are not present. Present day location of the well is approximately 1000 feet to the west of an active oil seep. The well is located within the Northwest planning area (see Map 2) on a recently leased tract that received a high bid of $21.51 per acre during the lease sale of 2004. Exploration and development is a distinct possibility within the next 20 years but it is unlikely this well will have an adverse impact on development since the well did not penetrate productive zones and future development will likely target deeper, more productive formations. Surficially, it is best to consider both Core # 14 and # 14A together. A drilling pad does not exist, the wellheads are non-threatening, and there are no solid wastes. There is some discrepancy between the USGS 305-L report and the BLM field findings in terms of the wellheads. According to the report, Core #14A was uncased and the casing for Core #14 was cut off at ground level. In 2002, BLM discovered both holes side-by-side with open casing Figure 30: Simpson Core Tests #14 and #14A. extending upwards 24 inches from the ground surface (Figure 30). The site was last visited in August 2002. This well does not pose any concern and should not be considered a risk to surface or sub-surface resources. East Simpson #2 East Simpson #2 was drilled in 1977 to 7,505 feet and cased to 6,427 feet. Five cement plugs were set, with the top of the shallowest plug set at 1,997 feet. The primary objective of the well was to test the Ivishak Sandstone where it onlaps the Pre-Devonian age basement rock (Husky Oil NPR Operations for U.S. Geological Survey, 1982). Small scale faulting was found between the wells in the area, possibly accounting for the thin section representing the Sadlerochit Formation. The well encountered very poor oil shows at 6,000 feet in the Torok Formation and Endicott age sandstones were cored with poor porosity and dead oil shows. The well is officially listed as a diy hole. Upon completion of the production tests, the well was plugged back to 1,997 feet and filled with approximately 280 bar•els of diesel to facilitate permafrost temperature measurements. However with East Simpson #1 less than five miles away, the USGS has no plans to use this well for temperature monitoring. The well is located within the Northwest planning area (see Map 2) on a recently leased tract that received a high bid of $21.51 per acre during the lease sale of 2004. Exploration and development is a distinct possibility within the next 20 years but it is unlikely this 39 well will have an adverse impact on development. If this exploration and development establishes infrastructure nearby, it would greatly facilitate plugging this well and significantly reduce costs. The wellhead consists of a casing head, side gate valve, a master gate valve, and a needle valve. The drilling pad is of the thin pad variety and is slowly being reclaimed by natural processes. Exposed pilings stick up a height of two feet from the surface, but no other objects needing removal are present (Figure 31). The cellar is a wooden 12' x 12' with standing water. With the existing plugs and the static condition of the well, there is no risk to surface or sub-surface resources. Kaolak #1 Kaolak #1 lies in the northwest portion of NPR-A and is considered one of the more remote well sites within the reserve. Kaolak #1 was drilled in 1951 to a depth of 6,952 feet and casing was set to 1,000 feet. Drilling served two purposes, to determine the presence of any reservoir characteristics, and to determine if oil or gas shows were present in this remote - portion of the reserve. The - site was chosen based on a seismograph survey in 1950 that identified an anticline at this location. The intent was to drill to a depth of 8,000 feet, but a windstorm destroyed the derrick. After the storm, the hole was abandoned due to unsatisfactory oil and gas shows. Findings indicated some very poor oil and gas shows in the Chandler Formation and very poor Figure 32: Kaolak #1 with cabin on the drill pad. shows in the Topagotuk Formation. Gas shows were attributed to association with the coal beds (Collins and Bergquist, 1958). Upon abandonment, no plugs were set and the hole was filled with heavy muds. The well is located on an unleased tract, in Southern NPR-A (see Map 2) where a lease sale is scheduled for 2008. Exploration and development in the .area is a possibility within 40 ,; Figure 31: East Simpson #2 is partially submerged during the spring thaw. Photo taken June 2003. the next 20 years, but since this well did not penetrate productive oil and gas zones it will not have an adverse impact. There are no major surface issues. The working area is still visible due to a multitude of wooden pilings around the wellhead and a cabin on the north end of the pad (Figure 32). Off the pad, the area is clean. The wellhead is missing its upper components. All that remains is the top flange above the base plate and the casing spool, leaving 11 3/-inch casing open to the envirorunent. The well is left with a casing head and is open to atmosphere. The wellsite is 45 miles southwest Wainwright, which is the nearest community. There are no hazardous materials or anything that would pose a risk to the general health and safety of the land. The cabin may be a concern, but dealing with the situation is outside the scope of this report. Meade #1 Meade #1 is a gas well drilled to a depth of 5,305 feet in 1950. The well was cased to 2,785 feet and two cement plugs were set, with the top of the shallowest plug tagged at 2,783 feet inside the casing. The well encountered some gas shows in one productive sand within the Grandstand Formation. The gas tested at rates up to 1.1 MMCFPD during openhole flow tests of the sand at 2,949 - 2,969 feet. The well is estimated to have gas reserves of 10 BCF. Gas pockets are relatively common in this portion of NPR-A due in large part to the underlying coal. At one point while conducting tests, some problems were encountered while attempting to pull a testing tool out of the hole; aball-peen hammer was inadvertently dropped downhole, causing the tubing to stick. The tubing could not be freed and as a result, it twisted off leaving tubing in the hole. When the lost tubing could not be pulled out, heavy muds were pumped downhole and the well was abandoned (Collins and Bergquist, 1958). The well is located within the Northwest planning area (see Map 2). The well is adjacent to a recently leased tract that received a high bid of $10.26 per acre during the 20041ease sale. Exploration and development is a distinct possibility within the next 20 years and has the potential to target the Grandstand Formation. If left unplugged the well has no potential to adversely affect future development. There is no pad present at Meade #1. Several pilings and light trash are present, but overall is pretty clean The wellhead is at ground level and consists of an open flange "~'~ ~ ~~`~ `~~~• bolted to the to of the cabin Fi ure 33 This ~~~r P g ( g )• ~`~ ~"!- ~ ~. , differs from the Navy reports that indicate the ~,~ ~N~~ ~ '~ ~.~' :~.~ ~ wellhead was abandoned in place. There is no F , :~ ~ ,,; ~, I ~ record as to why it was removed. A BLM field ~ . , {'~} crew bailed the hole and discovered a swedge ~_ and 2-inch needle valve junked downhole. This ~~' ~~~~ '~ - site is ve remote 30 miles south of At asuk ~~ and since the gas zones are currently isolated '~ ~ ~ - - ~ ~ below the cement plugs there is a limited risk of adverse im acts to surface or sub-surface - -- resources. Figure 33: Meade #1 wellhead. 41 Titaluk #1 Titaluk #1 was drilled in 1951 to a depth of 4,020 feet and is a diy hole. The well was drilled on the end of an anticline to test the oil and gas potential of foi~nations within the Nanushuk Group. A few very poor oil and gas shows were encountered in the Grandstand and Topagoiuk Formations, but no oil or gas was recovered during multiple production tests. The Ninuluk and Chandler Formations were also encountered, but with no shows. One cement plug was set at 3,471 feet. The placement of this plug is curious since the shows (albeit poor) were reportedly discovered above this level (Robinson and Bergquist, 1959). The well remains in a static condition. Titaluk #1 is located within the Northwest planning area (see Map 2) on an unleased tract. No offers were received in the June 20041ease sale. Near-term development is unlikely. Surficially, there are no concerns with this well. The well is open, 10 3/- inch casing above ground to a height of 3 feet. It is open to the atmosphere. The area of disturbance is completely revegetated with no solid waste concerns. The wooden cellar is in a state of disrepair and filled with water (Figure 34). The site is clean with very little debris. There are no hazardous conditions associated with the surface. The nearest settlement is Umiat, 60 miles to the east. The well poses no risks to human safety or the environment. Skull Cliff Core Test #1 Skull Cliff Core Test #1 was drilled in 1947 to a depth of 779 feet and is a dry hole. No shows of oil or gas were reported while drilling through the Gubik, Grandstand, and Topagoruk Formations. While drilling to the target depth of 1,500 feet, the drillstring was lost in the hole and fishing attempts were unsuccessful in recovering the lost drillstring. The drilling mud was bailed down to the top of the fish and the remainder of the well was filled with diesel to 54 feet to prevent the wellbore from freezing and facilitate downhole temperature measurements. It is plausible that the casing could corrode and the diesel fuel could seep into the sub-surface strata, but since there are no fresh water zones in the well it is not considered a risk that would adversely impact sub-surface resources (Collins and Brewer, 1961). The well is located within the Northeast planning area (see Map 2). The well lies adjacent to a recently leased tract that received a high bid of $10.77 per acre during the 20041ease sale. Exploration and development is a distinct possibility within the next 20 years but it 42 Figure 34: Titaluk #1 wellhead with wooden cellar. is unlikely this well will have an adverse impact on development since industry will likely target deeper, productive formations. An oil seep located at the base of Skull Cliff (land/ocean contact) was observed and documented in the 1940s, which influenced the Navy's decision to drill. BLM and USGS crews searched for the seep when they were in the area but nothing was found at the cliff/beach contact. However, another seep was reported in 1996 by a group from the Academy of Natural Sciences in a small gully about a mile to the east near the old radio tower site. This seep was never confirmed by BLM. Oumalik #1 Oumalik #1 was drilled in 1950 and is a dry hole. The well was drilled to a total depth of 11,872 feet and cased to 2,762 feet. It is the deepest well drilled by the early U.S. Navy program. The well location was positioned on the apex of the Ouinalik Anticline and drilled with the intent of revealing the oil, gas, and water content of the penetrated stratigraphy. Two cement plugs were set, the shallowest of which is inside the casing at 2,543 feet. Very poor oil and gas shows were reported in the Grandstand Formation, and poor gas shows were noted in both the Topagoiuk and Oumalik Formations. Small undetermined volumes of gas were recovered during multiple production tests. It is believed that the gas encountered was large enough to furnish fuel to a camp but not large enough to become a commercial producer. The gas encountered duuing drilling showed high gas pressure, but the sandstones in which they were observed are thin with low porosity (Robinson and Bergquist, 1956). The gas zones are currently isolated by the cement plugs and pose no risk to sub-surface resources. The wellhead and a fabricated plate are below ground level. Tvvo 2 '/2-inch nipples open to the atmosphere are above ground to allow thernistor cables to be run into the well. The well is located within the Northwest planning area (see Map 2) on unleased tract that received no bids during the lease sale of 2004. Near-term development is unlikely. If left 43 unplugged, the well has no potential to adversely affect future development. The existing pad contains piping from a ground refrigeration system similar to Topagoruk #1. The ground in this area is somewhat swampy with high susceptibility to permafrost melt. Circulating cooled diesel fuel in the pipes enabled drilling to occur without thawing the ground. The steel pilings were pulled from the ground to be reused at another site (Robinson and Bergquist, 1956). However, steel pipe filled with diesel fuel remains. A 6- inch circumference of stressed vegetation was noted around several of the low-cut pipes. Despite the diesel, the well does not pose a risk to any existing communities or habitation. It is in a remote location approximately 55 miles southeast of Atqasuk. Overall, the well poses no risk to people or the environment. East Oumalik #1 East Oumalik #1 was drilled on a ridge that overlooks an unnamed tributary of the Oumalik River. Topographic relief is approximately 100 feet. The drill site is highly remote as the nearest village (Atgasuk) is 65 miles away. The well was drilled in 1951 and reached a total depth of 6,035 feet and is cased to 1,100 feet. It is a dry hole. Very poor oil and gas shows were reported in the Grandstand Formation and very poor gas shows were reported in Topagoruk Formation. The well is located within the Northwest planning area (see Map 2) on an unleased tract that received no bids during the lease sale of 2004. It is unlikely that exploration and development will occur in the vicinity of this well in the near future. If left unplugged, the well has no potential to adversely affect future development. The well was left with open casing below ground level and has theimistor cables protruding from inside the casing. The casing is marked by a 7-foot, %-inch pipe. The open pipe lies within awater-filled cellar. The standing water has produced numerous algae and other aquatic vegetation obscuring the wellbore. Surficial hazards consist of several 10-foot timbers and a few 4-foot pipes (probably rig anchors) sticking up out of the ground. The site is mostly overgrown with shrubs and appears to be relatively clean. The airstrip, incoming, and outgoing trail scars are obvious and can be used to navigate to the wellsite. There are no risks associated with the well in its current condition and was given this ranking due to its close proximity to Oumalik #1. Topagoruk #1 Topagoruk #1 was drilled in 1951 to a depth of 7,154 feet and is a dry hole. The intent was to test a small, buried anticline and the various formations associated with it. The well was cased to 6,073 feet, plugged back to 6,175 feet and then drilled to a new total depth of 10,503 feet. Prior to re-drilling to total depth, approximately 250 barrels of crude oil from Cape Simpson were added downhole to help offset lost circulation and caving. Additionally, 20 barrels of diesel were added downhole during the drilling phase. No plugs exist in this well. The well is left with open casing to the surface and thermistor cables protruding from the casing (Figure 36). The well encountel•ed the following stratigraphic units while drilling; Gubik, Grandstand, Topagoruk, and Oumalik Formations, Middle and Upper Jurassic rocks, Shublik Formation (Triassic age), Permian rocks, and Lower-Middle Devonian rocks. Hydrocarbon shows were limited to a few very poor gas shows in the Oumalik Formation. No oil or gas was recovered during 44 multiple production tests (Collins and Bergquist, 1958). The well penetrated no fresh water aquifers and does not represent a tlu-eat to surface or sub- surface resources. The well is located within the Northwest planning area (see Map 2). It is adjacent to a recently leased tract, receiving a high bid of $50.00 per acre during the NW NPR-A lease sale of 2004. Exploration and development in the area is a distinct possibility within the next 20 years but since this well did not penetrate productive oil and gas zones it will not have an adverse impact. >~ ~,., - . ..,.,,~ ~ .~F~t _ l ~.• ~i r rep', There is not a visible pad, but rather an area of a~ ~„ '" - disturbance. Disturbance stretches /4 mile in an Figure 36: Topagoruk #1 casing on its east-west duection and /~ of a mile in a north- side. When the casing was pulled out of south direction. Solid wastes exist in the form of the ground, thermistor cables were piping remaining from a refrigeration system that discovered. circulated diesel to keep the permafrost frozen. A potential hazard exists because diesel still occupies the ground circulation lines. These lines stretch approximately 750 feet to the east, 250 feet to the north, and 100 feet to the south from the wellhead. Other debris on site include some large, partially-burned timbers, awater-filled wooden box (Figure 37) that resembles a cellar (I/4 mile east of the wellhead), and drilling muds. Atqasuk is the closest village approximately 30 miles to the southwest. The well is remote with the exception of a subsistence camp approximately one mile southwest of the wellhead along the Topagoruk River. Topagoruk's wellhead consists of an open hole cut off at the ground surface with several thermistor cables. A thin piece of weathered metal fits around the cut-off casing to resemble a marker. The weathered metal has been smashed at the base and now-lies bent in half on its side. Overall this site poses little hazard to the environment or human population. East Topagoruk #1 East Topagoruk #1 was drilled on top of a small ridge in the Chipp River delta in 1951. It reached a total depth of 3,589 feet and is cased to 1,100 feet. The purpose of the well was to test an anticline with closure as well as test the fluid content of the permeable Cretaceous sandstone (Collins and Bergquist, 1958). A very poor gas show in the Topagoruk Formation is the only reported hydrocarbons encountered in the well and no oil or gas was recovered during multiple production tests. One cement plug was set in the 45 Figure 37: Drilling muds and a wooden box that resembles a cellar are located about '/ mile east of the wellhead. well at 1,049 feet. The well is located within the Northwest planning area (see Map 2) on a recently leased tract. The tract receiving a high bid of $84.99 per acre during the NW NPR-A lease sale of 2004. Exploration and development in the vicinity of this well is a distinct possibility within the next 20 years but it is unlikely this well will have an adverse impact on development since the well did not penetrate productive zones and future development will likely target deeper formations. A drill pad does not exist. There are a few rig anchors near the wellhead, but no other surficial debris. The cun•ent state of the wellhead is open-ended 10 3/-inch casing. Casing height is tlu•ee feet above the ground surface. It is housed in a small 9' x 9' water-filled cellar. The area is remote and poses no health and safety risks to humans or the environment. Knifeblade Wells There were three shallow test wells drilled in the Knifeblade Ridge area. Knifeblade #1 was drilled on the ridge at the head of a small stream, with wells 2 and 2A drilled about a mile downstream. The wells are in a highly remote location with Umiat being the nearest settlement, 65 miles to the east. Knifeblade #1 Knifeblade #1 is a dry hole drilled in 1951. The well was drilled to a depth of 1,805 feet and cased to 1,211 feet. The purpose of the well was to test the oil and gas properties of the Grandstand and Tuktu Formations (Robinson and Bergquist, 1959). The well encountered very poor gas shows in the Killik Tongue of the Chandler Formation and very poor oil and gas shows in the Grandstand Formation. The well is located on an unleased tract, in Southern NPR-A (see Map 2) where a lease sale is scheduled for 2008. It is unlikely that exploration and development will occur in the vicinity of this well in the near future. If left unplugged, the well has no potential to adversely affect future development. Surficially, there are no concerns associated with this well. A drill pad does not exist and the wellhead consists of open-ended casing (Figure 38). The wellhead is 8 5/g- inch pinup inside 11 by 12 % -inch Figure 38: Knifeblade #1 is located in a marshy area at collar. The plumb-bob hit solid at 12 the headwaters of a small creek. feet. Total height for the well is about three feet. If this well is left in its current condition, it poses no risk to adversely impacting the surface or sub-surface resources. 46 Knifeblade #2 Knifeblade #2 is another dry hole drilled in 1951. It was the first of the three Knifeblade wells drilled and reached a total depth of 373 feet, cased to 45 feet, before being junked and abandoned. The purpose of the well was to test the oil and gas properties of the Grandstand and Tuktu Formations (Robinson and Bergquist, 1959). The well did not encounter any hydrocarbon shows. The well is located on an unleased tract, in Southern NPR-A (see Map 2) where a lease sale is scheduled for 2008. It is unlikely that exploration and development will occur in the vicinity of this well in the near future. If left unplugged, the well has no potential to adversely affect future development. Surficial issues are negligible. A drill pad does not exist and the wellhead consists of open-ended casing. There are approximately eight empty drums near Knifeblade #2 and #2A. The wells are highly remote and should not be considered a threat to the environment or human activity. Knifeblade #2A Knifeblade #2A, also drilled in 1951, reached a total depth of 1,805 feet and was cased to 38 feet. The well lies 28 feet to the north of Knifeblade #2A. The purpose of the well was to test the oil and gas properties of the Grandstand and Tuktu Formations (Robinson and Bergquist, 1959). Only very poor oil and gas shows were reported in the Grandstand Formation. The well was left with casing open to the atmosphere and poses no threat to surface or sub-surface resources in its current condition. The well is located on an unleased tract, in Southern NPR-A (see Map 2) where a lease sale is scheduled for 2008. It is unlikely that exploration and development will occur in the vicinity of this well in the near future. If left unplugged, the well has no potential to adversely affect future development. Simpson #1 Simpson #1 test well was drilled with a rotary rig in 1948 by the U.S. Navy. The well was drilled to a total depth of 7,002 feet and cased to 5,954 feet. The purpose of the well was to test the various formations of the Lower Cretaceous and Upper Jurassic rocks. The well encountered several very poor oil and gas shows and one productive gas sand in the Lower Jurassic at a depth of 6,183 - 6,193 feet. The well produced gas at rates up to 3.0 MMCFPD during open hole flow tests of this Lower Jurassic sand. The gas zones are currently isolated from other formations and the surface by two cement plugs set above the productive sand. The top of the shallowest plug is at 5,520 feet (Robinson and Yuster, 1959}. The well is located within the Northwest planning area (see Map 2) adjacent to recently leased tract that received a high bid of $7.51 per acre during the lease sale of 2004. Exploration and development in the vicinity of this well is a distinct possibility within the next 20 years and this exploration has the potential to target the Lower Jurassic. Since the well is partially plugged, however, it poses little risk to surface or sub-surface resources and will not likely adversely affect any future development. 47 The pad is highly visible and was constructed in the same fashion as Fish Creek #1 in which concrete was used as a working pad. Concrete was poured over a landing mat which was placed on pilings. As a result of ground movement from perniafrost freeze/thaw cycles, the concrete has buckled in numerous places creating apartially- collapsed surface. This feature provides excellent shelter to small animals and rodents. Additionally, there is a small pile of drilling muds near the wellhead. The well was left equipped with a casing flange, spool w/ side bull plug, and another flange and nipple and is shut-in with no pressure at surface. The components past the flange have since been removed. Overall, the current condition of the site is non-threatening to the sparse human population and the surrounding environment. North Simpson #1 North Simpson #1 was drilled in 1950 to a depth of 3,774 feet and cased to 109 feet. No hydrocarbon shows were reported during the drilling of this well as no sandstone was encountered (Robinson and Yuster, 1959). Upon completion, no plugs were set and the hole was filled back with muds. The well is located within the Northwest planning area (see Map 2) adjacent to a recently leased tract that received a high bid of $12.76 per acre during the NW NPR-A lease sale of 2004. Exploration and development in the vicinity of this well is a distinct possibility within the next 20 years but it is unlikely this well will have an adverse impact on development since the well did not penetrate productive zones and future development will likely target deeper formations. South Simpson #1 South Simpson #1 was drilled in 1977. The purpose of the hole was to test the Sadlerochit Formation where it laps onto the south flank of the Barrow Arch. The well was drilled to 8,795 feet and cased to 7,206 feet. Reports show that poor gas shows were identified in the Nanushuk Group, Kingak Shale and Shublik Formation. Gas flowed at a rate of 75 MCFPD between 6,522 - 6,568 feet within the Kingak Shale (Gyrc, 1988). The gas contained more than 70% nitrogen. The origin of the high nitrogen content is unknown, but appears to be a localized phenomenon (Bunuss, 2003). Sandstone tongues 48 (Simpson sand) within the Kingak Shale in the Simpson and Barrow localities are known to display good gas reservoir quality (Houseknecht 2001). Poor oil shows were discovered in the Nanushuk Group and Shublik and Torok Foi7nations. Drill stem tests did not recover any oil. The well is located within the Northwest planning area (see Map 2) on a recently leased tract that received a high bid of X5.01 per acre during the lease sale of 2004. Exploration and development is a distinct possibility in the near future since the well is properly plugged it will have no adverse impacts on development. Surficially, the pad and pits are in good shape. The cellar has been backfilled r figure 40: South Simpson #1 had its cellar backfilled with silt, with silt which resulted 1n consequently burying the casing head. the bu11a1 of the casing head (Figure 40). Above the surface, the wellhead consists of a 4-inch line pipe and a master valve. The master valve is frozen in the open position. The needle valve previously located above the master valve no longer exists. Beneath the casing head the well is plugged to surface and has no potential to adversely effect surface or sub-surface resources. The wellhead stands about eight feet high. Aplumb-bob was dropped and hit solid at 8 feet and stuck. It was subsequently lost. An old, stripped snowmachine sitting next to the wellhead is the only sizable object that would be considered solid waste. Overall, there is no risk associated with this well. Inigok #1 Inigok # 1 was drilled in 1979 to a depth of 20,102 feet and cased to 17,432 feet. The well objective was to test astructural/stratigraphic trap within the Sadlerochit and Lisburne Groups (Husky Oil NPR Operations for U.S. Geological Survey-Inigok, 1983). Some very poor gas shows were recorded in the Sag River, Nanushuk, and Endicott Group. Poor oil shows were reported for the Kingak Shale and Lisburne Group. The best shows were found in the base of the Torok Formation at 8,852 feet. No oil or gas was recovered during multiple production tests. The wellhead consists of three spools, each with a gate valve, a master valve, and a needle valve. Ten cement plugs were set in the well and it is plugged to surface. The well is located within the Northeast planning area (see Map 2) on a recently leased tract that received a high bid of $20.34 per acre during the lease sale of 2002. Total E&P Incorporated drilled an exploratory well 15 miles north of Inigok # 1 and used the gravel 49 pad and airstrip near the , : ,,,_,,• .,~ . _-..Y,; - well for staging areas and ~` }' a~ ~ ~ ~. a cam It would be . Si. ~ A..- ~ x ~ - ~k h ,~,,, it ~ Lt } ~ ~` h ~' ~ ' ~~ ~~ p. - _ , ,~ ~ ~ - F ~ ~ ,; s ~ fairly simple to remove ~~ ~r ' ~ " ~ the wellhead but the well ~ ~ ~ .. - ~ `~ ' ^ ~ ' has no potential to ~ ~ ~ $ ,~ rfr ` ~ ~; s ~ adversely affect surface ~~ar ~ f:~; ~~" x ~ ~ t or sub-surface resources ,~ } ie~ ~'~; ~ l ~'tN7v i`~h h C't V' ~T ~~' ti b ~ ~. - . ; ~ ~ ~ ~ ~~,~ ~~ , p r ,~,~, 3 r~~ ~ ~" Additionally, the well .s ~~"~` ~~ ~- z ~ . _ ~ F , + ~ ~ ~; ~„~.., poses no threat to _ T.}~~y $ ~ ~ ~X r'.~ `W adversely affect future ' ~r ~~' ~`%~ -te ~ "• 1 ~{ ~ , •, r, „,A development. , ~~ _ •, _ r ~= Inigok # 1 is one of the few logistical Centers Figure 41: Aerial view of Inigok #1. The drill pad and reserve pit within NPR-A (Figure are visible in the top of photograph. A road leads from the apron of 41). The airstrip and pad the airstrip to the drilling pad. are maintained with no solid wastes present. The wellhead poses no risk, and with the plugs already in place, could be removed. Additionally, this well has ayear-round airstrip and serves as a logistical base to various NPR-A activities. USGS Monitored Wells The USGS has used wells drilled in the NPR-A for collecting temperature data to better understand both the global temperature pattern and its effects on the permafrost. The wells that are currently used are properly plugged above the hydrocarbon bearing zones and into the well casing. The wells are filled with diesel fuel down to the shallowest plug at depths ranging from 1,500 - 3,000 feet. For a list of wells see Appendix B. The program began in 1958 and will continue for the foreseeable future. After this project ends, the wells will have the diesel extracted and the well will be properly plugged to surface. Diesel is anon-corrosive agent, and even if the casing should corrode there would be no impact to the surface resources and minimal impact on the sub-surface resources as there are no known fresh water aquifers in NPR-A. The following wells are monitor wells with surficial issues. It is difficult to establish a rank since the wells are sufficiently plugged. The cleanup priority is difficult to deterniine as the primary tlu•eat lies with wells having downhole issues. However, political concerns could influence the timing in which the surface issues are dealt. East Teshekpuk #1 East Teshekpuk #1 was spudded in March 1976. The well was drilled to a depth of 10,664 feet. It is an active USGS monitor well that was properly plugged. The top of the shallowest plug is located at 2,400 feet. From that point to the surface, the hole is filled with diesel fuel. With the well properly plugged and diesel fuel being anon-corrosive agent, there is no downhole issue with the well at this time but there are solid wastes buried on site that may wan•ant removal. 50 East Teshekpuk #1 was drilled on a small peninsula on the southeast side of Teshekpuk Lake. The southern shore of the peninsula is protected from the prevailing northerly winds, however the north shore doesn't have the luxury of a barrier and is subject to erosion. Unfortunately, solid wastes from the camp and drilling operation were buried on the northern portion of the pad, possibly in the old reserve pit. The northern shore has been battered by numerous storms which have eroded the shoreline and exposed the solid wastes. The wastes are unsightly and potentially hazardous. While the nearest village of Nuigsut is 52 miles to the southeast, Teshekpuk Lake is rich in subsistence resources and numerous sunnner cabins dot the lake's shoreline. It is possible that at the time of surficial restoration, the downhole could be pumped free of diesel and plugged to the surface. Awuna #1 Awuna #1 was spudded February 1980 and completed April 1981. It is the only well drilled in the southwest portion of NPR-A and is 90 miles south-southwest of Atgasuk. Awuna is the most remote well in the entire petroleum reserve. The well was drilled to a total depth of 11,200 feet. Drilling was conducted over two consecutive winters. Ice roads and an ice airstrip were constructed for logistical support. The project cost approximately $6 million (Husky Oil NPR Operations-Awuna, pg 5). Due to the orientation of the pad, the prevailing winds force wave action into the drilling pad, undermining the sands and silts which make up the pad. Below the sands and silts, Styrofoam was used to insulate the underlying permafrost. Wave action has eroded tens of feet into the drilling pad, exposing the Styrofoam, which consequently breaks loose and blows away. Wooden pilings exposed from erosion show how much attrition has taken place. Styrofoam can be seen all around the pad with pieces blown up to 5 miles away. f Downhole, the well is in good shape with sufficient plugs. Diesel fuel fills the top 4,000 feet. The well is an USGS monitor well. Wellhead components are in working condition with no problems. The inunediate concern with this site is the blowing Styrofoam, but as the years progress erosion could become a major issue (Figure 42). The loose Styrofoam should be cleaned Figure 42: Awuna wellhead with exposed wooden pilings and up and erosion progress Styrofoam. should be monitored on an annual basis. It is also worth mentioning that the same type of scenario is unfolding at Tunalik #1 (another USGS well). Wave action from the reserve pit is beginning to 51 undermine Styrofoam from the drilling pad. Tunalik #1 differs from Awuna #1 in that prevailing wind direction does not force erosion in the direction of the wellhead. Uncased Core Tests There are thirty-nine uncased core test holes. These holes were typically left filled with drilling mud and abandoned without being plugged. Drilling depths ranged between 500 and 1,500 feet depending on the purpose of the test. By nature, core tests were drilled to test soils, permafrost, or lithologic units. They were not drilled for oil or gas exploration purposes and did not encounter hydrocarbons. Many of the cores are stored in the Alaska Geologic Materials Center (Figure 43). The BLM has examined the cores and they are extremely friable. It is likely that these uncased core holes have naturally collapsed and harmlessly blended into the environment. There is no surface indication of their location and BLM has been unsuccessful in locating them during several visits to their reported location. They do not pose any potential risks. Barrow Gas Wells The Barrow Gas Field Act of 1984 (P.L. 98-366, 98 Stat. 468, July 17, 1984) allowed the U.S. Navy to transfer several wells to the North Slope Borough. The Navy drilled six shallow wells between 1953 and 1974 to test the natural gas potential. Between 1974 and 1982, 10 additional wells were drilled to help supplement the local gas supply. The wells were developed for use by the local government agencies and Barrow residents. The act conveyed the sub-surface estate, held by the federal government and any other interest therein, to the Arctic Slope Regional Corporation (ASRC). The BLM acknowledges the surface and sub-surface. lands as conveyed and the Office of the Regional Solicitor has confirmed that the Transfer Act included the wells and well locations, and any liabilities associated with these wells are the responsibility of ASRC. 52 Figure 43: Core samples from Simpson Core Test #25, an uncased core test, are stored in the Alaska Geologic Materials Center. Plugged Wells Square Lake #1 Square Lake #1 is a Navy well that was drilled to a depth of 3,984 feet. Its primacy intent was to test the Cretaceous rocks in east-west trending anticline structure (305H pg 424). No significant shows of oil were found. Gas shows were encountered in various sandstone beds between 1,600 and 1,900 feet, but otherwise the hole was dry. Upon completion, four plugs were reported to be set with the upper plug at 728 feet, well above the gas shows. Two other plugs were reported to be set in the gas zone, spanning depths of 1,640 - 1,840 and 1865 - 1934 feet. In addition to the six plugs, water and mud fill the remaining distance to the surface (Collins and Berquist, 1959). Upon successive visits to the site, BLM field crews dropped aplumb-bob down the hole and hit a solid obstruction between 8 and 10 feet. Don Meares, Northern Field Office, visited the site in August 2003 with an underwater camera and determined the solid surface to be cement. The Square Lake area is clean of debris wellhead that could pose a ground hazard level. with a few deadmen pilings (anchors) near the . The wellhead is open casing cut off at ground Umiat #2 and #5 The Umiat #2 and #5 wells were plugged and abandoned in 2002 by the COE (Figure 44). The wells were drilled on a common four-acre pad in 1947 and 1951. The purpose of the wells was to test for producing lithologies and determine petroleum quantities. Umiat #2 penetrated the Gubik Formation, Nanushuk Group (Chandler and Grandstand Formations), Topagoiuk Formation and Oumalik Formation. Problems with the drilling muds were encountered while drilling Umiat #2. Analysts determined that the fresh water drilling fluid caused formation damage and the Umiat #5 well was drilled adjacent to the #2 with acable-tool rig. The well produced 400 barrels per day with the most productive sandstones in the lower Chandler and upper Grandstand. Below a depth of 1075 feet, 107 ban•els of crude oil from both Umiat and Simpson were used as a drilling fluid, as well as 11 barrels of diesel fuel (Robinson and Bergquist, 1956). In 2000, the Colville River threatened to erode both wellsites away. The COE took action under the FUDS program in the winter of 2001-2002 to plug, abandon and remove any surface features. The concrete lined cellar of Umiat #2 and wooden platform Figure 44: Plugging operations at Umiat #5. M. from Umiat #5 were removed. Costs were approximately $25 million dollars due in part, to soil Approximately 30,000 tons of petroleum-contaminated soil was excavated. remediation. The soil was 53 transported on an ice road to the Umiat camp where it was thermally treated in a rotary kiln to remove petroleum residues. Small quantities of PCB contaminants were unexpectedly encountered after the excavation was completed. The source of the PCBs has been linked back to the #5 well and the fluids used downhole. The ever-shifting Colville River continues to erode the north bank and is approximately 50 feet from the old wellbores. With the removal of hazardous soils, this site should not be considered a threat to humans or the environment. Umiat #3 Umiat #3, also known as Umiat Core Test #1, was spudded in December 1946 and drilled to test some of the oil bearing zones encountered while drilling Umiat #1. The well was drilled on the northeast corner of Umiat Lake just below the hill from Umiat #4 (Figure 45). Umiat #3 penetrated the Gubik Formation and the Nanushuk Group. The Grandstand ;; ~~ : Formation within the Nanushuk .~4 ' _ ~.~'~ t . Group is considered to be the ,~. primary source of oil between the depths of 258 and 514 feet. The hole produced 50 barrels per day prior to shutdown. The well was re- tested nine months later with production dropping to 24 barrels per day (Robinson and Bergquist, 1956). The wellhead consists of homemade cotnponents with a single water service type valve and is capped with a needle valve. There is no seeping present at this Figure 45: The view from Umiat #4 looking southwest site, however seeps are common in toward Umiat Lake and Umiat. Umiat #3 is located on the area, including an active seep in the near shore of Umiat Lake. Umiat Lake. An extensive piping system is still visible. The pipes probably supplied water during the drilling phase. They connect Umiat #3 to #4 which then follow the hill from Umiat #4 to aside channel of the Colville River. Their function was to either carry water to the drilling sites or assist during the well's production phase. The overall surficial conditions including the wellhead and piping, do not pose a tlueat to human health nor the environment. BLM plugged the well in May 2004. Umiat #4 After encountering relatively poor oil shows on the first three wells, operations were suspended until 1950. Cable tool drilling rigs were introduced to determine if the fresh water muds had hindered the oil production in the previous wells (Robinson and Bergquist, 1956). Cable tool wells did not require the excavation of a cellar; therefore Umiat wells #4-#7 did not have cellars. Umiat #4 is located on top of the hill to the northeast of Umiat #3 (Figures 45, 46). The well was drilled May 1950 to a maximum depth of 840 feet. The hole bored through the Ninuluk, Chandler and Grandstand Foiniations. Oil was found in the upper and lower 54 sandstone of the Grandstand Formation. Drilling encountered good oil shows around 300 feet with a total 500 barrels produced (Robinson and Bergquist, 1956). The wellhead consists of 11 '/-inch casing protruding 36 inches above the ground surface. The casing is capped with a steel plate. Upon removal of the cover, the hole was open to the environment. No valves or gauges are present. The well was plugged by the BLM on May 9, 2004. The well poses no risk to humans or the environment. Umiat #8 Like the other wells drilled in the 1950s, Umiat #8 was drilled using cable tools. The well was spudded May 1951 and completed August 1951. It is located on top of a ridge that separates Umiat from the Bear Paw Creek valley. Drilling intention was to determine the quality and quantity of hydrocarbons in the Grandstand formation near the crest of the anticline structure. The hole encountered the Seabee, Ninuluk, Chandler, and Grandstand Forniations. The Grandstand Fornlation produced approximately 60-100 barrels per day of oil and more than 6 million cubic feet per day of gas. The well was shut in with a gas pressure of 275 pounds per square inch. The gas was analyzed by the Bureau of Mines and determined to be 97.3 per cent methane. Brine was mixed (35 lbs of salt per barrel of water) and used in the drilling fluid to prevent freeze up. Brine solution of approximately the same ratio of salt per barrel of water was used to kill the well and set the plug while cementing casing. A total of 21,695 pounds of salt were used in the well (Robinson and Bergquist, 1956). The well was plugged May 2, 2004. Prior to plugging, the well was nicknamed the "Whistling Well" due to the gas of which was escaping through fittings and valves in the wellhead. The wellhead is easily the most complex of the 11 Umiat test wells. It consists of five valves and multiple gauges. It has several homemade components and reaches a total height of ten feet. After reporting the seeping gas in 1996, two new valves and gauges were installed in 1997. The new gauges have been checked regularly since 1998 and have consistently read 250 psi. Despite replacing the two valves and gauges, gas continued to leak from the wellhead. The largest of the leaks occurred just above the top flange where a 4-inch nipple and collar are welded together. Other leaking occurred at the fittings of some of the gauges. The wellhead is sited on a gravel pad. A series of piping extends from the wellhead to a small stock tank about 100 feet to the south. The tank probably was used as a holding tank for the oil while testing the production potential of the hole. The same style of stock tank is present in various old photographs found in the Umiat area and may be the same 55 Figure 46: Umiat #4 prior to plugging. The wellhead is located in the center of the photograph. tank. Oil from inside the tank was sampled in 2004 with test results positively identifying PCB contamination which is slightly below the level of concern. Umiat #10 Umiat #10 was spudded September 1951 and completed January 1952. This well was drilled to test the Umiat anticline and is located about a half mile northwest of Umiat #8. Total depth of the well is about 1,573 feet. When the well was bailed, it produced 222 barrels of oil in a 24-hour time span. The most productive layers occurred at 980 feet and 1,095 feet, penetrating both the Ninuluk and Grandstand Formation (Robinson and Bergquist, 1956). Also encountered were the Seabee and Chandler Formations. The hole was somewhat problematic as it caved considerably during drilling. Operations consisted of a drill rig set on a foundation of 12" x 12" timbers with a thin layer of gravel in between. Twenty-five pounds of salt mixed downhole to help lubricate the drill bit above the 650-foot marker (from the surface). More Aquagel-brine mud was used down to about 1,000 feet to keep the hole from caving. The wellhead contains two valves; a master and a gate, both are closed. The- total height of Umiat #10 is approximately 10 feet. The 8 Sis-inch casing is flared and open at the top. This well was plugged May 6, 2004 (Figure 47). with Aquagel and water (per barrel) were used The surface near Umiat #10 is in good shape. There is no existing pad and no solid wastes. With the recent plugging of the well, it is not a risk to human health and safety or the environment. 56 Figure 47: Plugging operations at Umiat #10. May 2004. APPENDIX B 20 Wells Currently Monitored by the United States Geological Survey: NAME Atigaru Awuna* Drew Point East Simpson # 1 East Teshekpuk West Fish Creek #1 Ikpikpuk Kugura Koluktak* Kuyanak Lisburne North Inigok North Kalikpik Peard Bay Seabee* South Meade South Harrison Bay Tunalik* Tulageak West Dease HOLE DEPTH(meters) 648 884 640 600 727 735 615 582 227 856 532 62~ 660 591 393 549 399 556 756 823 *Are also part of the CALM network (Circumpolar Active-Layer Monitoring). 57 0 0 NOTE TO FILE Wolf Creek #3 100-119 Recommendation for Well Status Change It is recommended that the status of this well be changed from plugged and abandoned ("P&A") to a shut-in completed oil well (1 -oil). Wolf Creek #3 is one of a number of legacy wells drilled in Alaska prior to statehood. This well was drilled in 1952 and while the current status is shown to be P&,A, no cement has ever been placed in the wellbore to plug the well according to either State of Alaska or Bureau of Land Management ("BLM") regulations. Accordingly the presently carried P&A status is not correct and should be changed to 1 -oil. Thomas E. Maunder, PE Sr. Petroleum Engineer ck Stephan F. Davies Petroleum Geologist q- a - 0�0 WkNNED JAN 1 9, 2007 1.\..1;;. UUUal e e Subject: Re: Umiat From: Stan_Porhola@ak.blm.gov Date: Wed, 21 Ju12004 15:46:12 -0800 To: Thomas Maunder <tom_maunder@admin.state.ak.us> Umiat #8 was plugged with a downhole plug through the tubing across the active reservoir. A surface plug was set in both the annulus and tubing, with the top of the plug at 73' and 0' respectively. Umiat #10 was plugged with a bridge plug and 100' of cement above. Umiat #4 was plugged with a fluid level at 201', followed by water to 101', a gel pill to 70' and a surface plug to 11'. Tubing and rods were cut and left in the well. Umiat #3 was plugged with a fluid level at 118', followed by a gel pill to 93' and a surface plug to 66' (after falling 60'). Tubing was cut and left in the well. Work scheduled for winter 2005 includes topping off the surface plug for Umiat #3 and setting surface plugs for Umiat #6, #7 and #9. Previous plans to plug Umiat #1 and #11 have been put on hold. Work scheduled for summer 2004 includes PCB testing of well fluids for Wolf Creek #3 and possible wellhead improvements to Wolf Creek #1. ~ '--' 4-.\QC,¡I"""'\'~ The next likely target for plugging efforts by BLM (pending additional funding) would be the Wolf Creek area (wells 1,2,3). Stan Porhola BLM - Alaska Petroleum Engineer 267-1469 :t ~:; 1 of 1 7/21/20043:50 PM 26" Hole 125 gJ< 01 Gal-Seal 1 T' Hole 210 gJ< 01 High-Early 12 1/4" Hole 9 5/8" Hole Depth: 1528'-1545' Depth: 1548'-1565' Depth: 1847'-1670' Depth: 2038' ·2076' 7112" Hole PElTe:::: 554' Max :::: 445 MCFfe :::: psig Flowing :::: 44° Wolfcreek #3 Wolfcreek Field Current Well bore Schematic 32.W (Caustic Soda) Wolfcreek #3 Surface Diagram \ Well Head Description (6" stick up): ACTUAL 10 3/4" casing (9 3/4" ID) - top of casing serrated Well Head Description (2' stick up): REPORTED - USGS305H Report 11 3/4" casing collar 1/2" steel plate welded to collar 4" plugged pipe extending to 2' above ground leve! 0 0 WOLF CREEK TEST WELL NO. 3 CRETACEOUS Ninuluk Formation: 301-5001 Chandler Formation, Killik tongue: 5001-14001 Grandstand Formation: 14001-27601 Topagoruk Formation (Torok): 2,7601-37601 5ta'ANNED AUG 3 12007 jtpxA }i'orm 9-693 (April 1952) . UNITED STATES DEPARTMENT OF THE INTERIOR GEOLOGICAL SURVEY CONSERVATION DIVISION . * Sec. ____ . , : I ¡ , , ' _____..______,______1______ , , ' , , . : : i _____.I_____.I_____.t-____ ! i I' , , ------:----_.¡._----:._---- ! ¡ ! , I ! T. ___________ R. _____ INDIVIDUAL WELL RECORD _______________________ Mer. ~ No P. R.. #4 Land office ._.______.:.~_. Date___J~!1~L~-,-.l9.2 9 Ref. No. _________ State Alaska Serial No. _____-=____________ ~~ Lessee ____________-==--______________. Field____Wo}of Creelt_A.1;_~-ª. ---- Operator _--"P.!..-ª-.L.Nanr______ District West Coast Regio!L____________ W èll No. -----~~!~__~~~~~__!~!~__~~!_L!~_______ * Subdivision __________________.___________________________ * Location --~-~--!-~--.~~~~___!~_~E__~_~___<?_~__~..<?.!J_.9E~_~~__~~~_~__.W~!!jJ.!)____.________.___._____________________ _, 19_____ Well elevation ___ ~.. I. ________ feet Drilling approved _ D ·11' d Aua 20 952 rl mg commence _____:.:=..~_____, 1 _ 3,760 I Total depth ____________ ~eet D ·11· d Nov 3 1952 rl mg cease ____-L-____, ____ Initial production Completed for production ___________, 19_____ Abandoned Ar~...I(~ *~·fJtIlD!lKiL--.NcY....-(.1.->-, 19-52.. Geologic Formations Surface Lowest tested Gravity A. P. I. ---- Initial R. P. ____ Productive Horizons .Depths Name Contents ___________________ a___...________________ ------------------------- ---------------------- ------------------- WELL STATUS --------------------------------... ------------------------- ------------- YEAR JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEPT. OCT. Nov. DEC. 1952 nJ?_~.&.! uº-~.&.L º~.&!_-- u~þ"çtL ------------ ----------- ----------- --...------- ----------- ----------... _____0___- ----------- ----------- ----------...----- ----------- ----------- ----------- ----------- ----------... ----------- ---...------- ----------- ----------- ----------- ---------- ---------- -------.--------- ----------- ----------- ---------- ----------- ----------- ----------- ----------- ----------- ----------- ----------- ----------- ---------- ---------------- ----------- ----------- ----------- ----------- ----------~ ----------- ----------- ----------- ----------- ----------- ---------- -------- ------..--..------ ----------- ----------- ----------- ----------- --- -------- ----------- ----------- ----------- ----------- ----------- ---------- ------- R * Unsurveyed EMARKS__n__________________uuu________________________________u___-------------------------------------------------------------------- ---------------------------------------..------------------------------------------------------------------------------------------------------ ----------------------------------------------------------------------_...-------------------------------------------------------------------------------- ---------------------------------------------------------------------------------------------------------------------------------------------------------- -------------------ueõTõgfcãr-g-ürveÿ--Prõfesslonar-Paper--30T----u---------------------------------- --------------------------------------------------------------------------------------------------------------------------------...-- U. 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F -- Ãr---y )( )( >< X X X' X X ft ~ À:/ ,X X' Notes from drillJ:' records Depth Uut) b 53__________ Set 53 ft of ll~- . 54-lb seamless 8-thread casing at 53 ft, and cemented it with 7 sacks of Cal-Seal poured between the casing and the wall of the hole. 60__________ Drilling fluid was changed from fresh water to brine made of 25 to 35 lb of salt per bbl of water. 725_________ Bits 7, 8, 9, and 10 were battered in drilling through hard rock at 725-726 ft. 768_________ A slight show of gas was noted while drilling at 768 ft. 900_________ Below 900 ft, salt was added to the water at irregular intervals and in amounts less than 20 lb per bbl of water, because of the difficulty of keeping an adequate supply of salt at the rig. 961.________ Water entered the hole from a sandstone bed at 940-960 ft. A 3-hr bailing test showed it to be entering at a rate of 20 gal per hr. Salinity was 9,400 parts per million sodium chloride. 980_________ Broke sand-line sheave and installed new one in 4 hr. Bailing showed that water was entering the hole at a rate of 20 gal per hr. 1,060________ Water was shown by bailing test to be still enter- fug the hole at the same rate as before. 1,155________ The dump-bailer chain was lost in the hole, but drilling proceeded past it with no difficulty. 1,185________ Water entering the hole decreased to 10 gal per hr. 1,280________ The drive shaft operating the drawworks from the power unit was twisted off, and operations were shut down 39 hr for repairs. The hole was then found to be bridged at 1,160 ft and, after cleaning it out to 1,280 ft, 27 bailers of mud and water were recovered. The water contained 9,405 parts per million sodium chloride. 1,400________ Changed to a lighter string of stem and jars. 1,600________ The Baker core barrel was lowered in the hole, but it did not get to the bottom because of caving shale. The hole was cleaned out to the bottom with bit 25. The hole was crooked and caused the drilling lihe to wear excessively. 1,618________ After coring from 1,615 to 1,618 ft, the hole was filled with fresh water, but a large amount was absorbed by the rock, and the water level could not be brought above 241 ft. The fresh water caused the rock to cave, and the sonde for the electric log could not be lowered past 1,128 ft. As in Wolf Creek test well 1, the fresh water apparently affected the self-potential curve, so that it did not clearly reflect lithologic changes. A ll~-in. collar was placed on top of the casing at ground level, and the well was abandoned.. C WOLF CREEK TEST WELL S => Location: Lat 69°23'n" N., long 153°31'25" W. Elevation: Ground, 732 feet; kelly bushing, 750 feet. Spudded: August 20, 1952. Completed: November 3, 1952; dry and abandoned. Total depth: 3,760 feet. Wolf Creek: test well 3, the seCond test on the crest of the anticline, was planned to test the sandstone beds /? (~.~ ~.~ 1e ¡ \...- . . ,-" .. ... . ... . . .. , A.J...a.... . ..A - - of the Gran~ formation which were oil-bearine _ the Umiat .fi~d which were not reached by the first two Wolf Creek wells. The well is 485 feet west of Wolf Creek test well 1 and is in a similar structural position, being only 30 feet lower structurally than the first test., Below 12 feet of unsampled deposits, possibly 'i alluvium (18 to 30 feet), the hole went through the ~ Ninuluk formation (30 to 500 feet), the Killik tongue (, of the Chandler formation (500 to 1,400 feet), the ~ Grandstand for~tion (1,400 to 2,760 feet), and 1,000 ~ feet of the Topagoruk formation before being aban- ) doned at 3,760 feet. /) Because Wolf Creek: test well 1 was an adequate test of the beds above 1,500 feet, no cores or tests were made in Wolf Creek test well 3 above that depth. A few shows of gas were obtained in 5 formation tests between 1,500 and 2,100 feet. The quantity of gas available appeared sufficient to heat a small camp in the vicinity but was inadequate for commercial use. Below 2,100 feet only 2 of 5 formation tests recovered any petro- leum-a very weak blow of gas in 1 case and 2 gallons of oil in the other. The oil may have come from the oil-emulsion mud with which the hole was drilled. DESCRIPTION OF CORES AND CUTTINGS Descriptions of the rocks penetrated in Wolf Creek test well 3 are based on examinations of cores and cutting samples. Composition as shown on the graphic log, however, is determined in part by interpretation of the electric log. The material was described dry, and colors were determined by comparison with the Rock Color Chart (Goddard and others, 1948). The depths were measured from the top of the kelly bushing. Abundance of microfossil specimens mentioned at the beginning of each core description is defined as fol- lows: 1-4, very rare; 5-11, rare; 12-25, common; 26-5~~ (jÞ abundant; more than 50, very abundant. (4;.JL Lithologic description ô^ ç [Wbere no core Is listed. description Is based OD cutt1Dg samples) Core Depth (feet) Remarks 0-18 18-30 30-40 Kelly bushing to ground level. No sample. Sandstone, med.ium-light-gray, very fine- _ grained, slightly argillaceous and silty, slightly calcareous; some grayish-yellow argillaceous calcareous siltstone that grades to very fine-grained sandstone. Top of Ninuluk fOrmation at 30 ft. C!àystone, med.ium-gray, slightly silty, slightly calcareous, nonmicaceous¡ and sandstone as above, with very small amount siltstone in upper part. .40-00 r( W C.3 n_j 458 EXPLORATION .AVAL PETROLEUM RESERVE NO.4, .SKA, 1944-ó3 IAthoZogic tle.orlJ)tion.-Continued LithoZogic tleBcriJ)ticm-Continued Core Depth (feet) Core Depth (feet) Remarks 60-70 70-90 90-100 100-110 110-120 120-130 130-140 140-150 150-160 160-170 170-180 180-210 210-230 230-240 240-250 250-290 290-300 300-360 Remarks Claystone, as above; and medium-dark- gray slightly silty in part nonmicaceous clay shale. Clay shale, as above; with claystone and a small amount of sandstone and grayish- yellow noncalcareous clay ironstone with conchoidal fracture in the lower half. Siltstone, medium-light-gray, slightly cal- careous, argillaceous. Siltstone, with claystone and clay shale as described above. Clay shale; with very fine grained slightly calcareous to calcareous sandstone; and siltstone; and a trace of claystone and clay ironstone. . Siltstone, with a small amount cl&y shale. Clay shale, medium-dark-gray; and black clay shale with coaly partings; some silt- stone, and a trace of coal. Siltstone, with a very small amount clay shale, clay ironstone, and sandstone. Siltstone, and clay shale. Sandstone, yellowish-gray, fine-grained, salt and pepper, very slightly argillaceous and silty, noncalcareous, friable; some siltstone and a trace of black shale, coal, and white and pinkish-white bentonite. Siltstone, partly sandy, noncalcareous; trace of sandstone and clay ironstone. Sandstone, as above, slightly calcareous in part; composed of white and clear quartz, gray chert, brown and ds.rk rock frag- ments, and rare green grains. Grains are angular to subangular, commonly frosted. Some slightly calcareous clay- stone in the lower 10 ft. Sandstone, as above, but fine- to medium- grained; some claystone in the bottom half. Electric log indicates claystone at 210-240 ft. Sandstone, fine-grained, not silty or argil- laceous; very slightly calcareous; a very small amount claystone is slightly cal- careous to very calcareous. Claystone, with some sandstone as above. Sandstone, light-gray, fine- to medium- grained, salt and pepper, nonsilty, noncalcareous, a large proportion of rock fragments in the sand grains. Medium-gray calcareous claystone is very rare. Sandstonl', as above; with some claystone. Claystone, medium-gray, slightly calcar- eous, and some medium-dark-gray non- calcareous c1ay shale; grades with depth to a greater amount of clay shale and less c1aystone. A small amount of siltstone is at 320-340 ft, and a small amount of sandstone at 310-320 and 340-360 ft. 360-370 370-380 380-390 390-400 400-430 430-460 460-500 500-530 530-540 540-560 560-570 570-580 580-590 590-600 600-610 610-620 620-630 630-685 685-700 700-740 740-790 790-800 Sandstone, light-gray, very fine- to fine- grained, slightly silty, noncalcareous; some clay shale and claystone. Sandstone, very fine-grained, silty, argil- 1aceous, micaceous. Clay shale, medium-dark-gray; a very small amount siltstone and c1aystone. Siltstone, claystone, and clay shale, with a very small amount sandstone.. Clay shale, medium-dark-gray, noncal- careous. Sandstone, very fine-grained, salt and pepper, slightly silty, noncalcareous; it is fine grained in upper 10 ft with a trace of clay shale. Sandstone, very fine-grained, very silty and argillaceous, slightly calcareous in part; a small amount clay shale at 460- 480 and 490-500 ft, and a trace of c1ay ironstone at 480-490 ft. Clay shale, medium-dark- to dark-gray; a small amount medium-gray siltstone and sandstone and a trace of clay ironstone at 500-510 ft. Top of Killik tongue of Chandler formation at 500 -ª. Clay shale, with some claystone, trace of siltstone and sandstone. Siltstone, with clay shale, and some slightly calcareous to calcareous sand- stone. - Clay shale, with siltstone. Clay shale, with some siltstone, a very small amount sandstone and c1aystone, and traces clay ironstone, black shale, and coal. Sandstone, siltstone, and shale. Siltstone and sandstone, medium-light- gray, veIY argillaceous, slightly cal- careous in part. Siltstone, a small amount of sandstone and clay shale. Sandstone, noncalcareous, with siltstone and clay shale. Clay shale, silty; and siltstone, with a a trace of sandstone. Clay shale, medium-dark-gray, silty; a small amount of slightly calcareous siltstone. Clay shale, medium-dark-gray, slightly silty. Clay shale, with some b1ack shale and coal. Clay shale, medium-dark-gray, slightly silty in part, non calcareous. A trace of sandstone at 760-770 ft composed of clear quartz. A small amount b1ack shale and trace of coal in the lower 20 ft. Siltstone, medium-light-gray, very argil- 1aceous, non calcareous; a small amount clay shale and sandstone. TEST WELLS, SQUARE LAKE AND WOLF CREEK AREAS, ALAS.1!o..A. 4u~ Lithologic de8cri~ntinUed Core Depth (feet) Remarks 800-810 810-830 830-840 840-850 850-860 86O-S70 870-880 880-890 890-900 900-920 920-940 940-950 950-960 960-970 970-980 980-990 990-1,000 1,000-1,010 1,010-1,020 1,020-1,050 1,050-1,060 1,060-1,070 I, 070-1, 090 1,090-1,120 1, 120-1, 130 1,130-1, 150 Sandstone and siltstone; a very small amount clay shale. Clay shale, silty; grades to siltstone; very fine-grained silty argillaceous mi- caceous siltstone and sandstone, with rare carbonaceous fiakes. Sand grains are clear quartz, with some white quartz and rare rock fragments. Clay shale, with a very small amount black shale. Clay shale, black; some medium-dark- gray clay shale, and a small amount coal. Clay shale, with a small amount white siltstone having a sugary texture and composed of subangular clear clean quartz grains. Clay shale, a very small amount light-gray very fine-grained non calcareous sand- stone with a white silty matrix; com- posed of clear and white quartz with very rare rock fragments. One piece very light-gray cherty limestone. Clay shale, silty, micaceous; with sand- stone as above. Sandstone, very fine-grained, as above; some clay shale. Clay shale, silty. Siltstone, argillaceous; grades to silty clay shale. Clay shale, medium-dark-gray; some black shale and a small amount coal which increases slightly in the lower part. Sandstone, very fine-grained, very argil- laceous and silty; grades to very sandy siltstone; also clay shale. Clay shale, with black shale and coal, and a minor amount sandstone. Clay shale, with a minor amount black shale and coal, and a trace of sandstone. Clay shale, medium- and medium-dark- gray, silty in part. Sandstone, medium-light-gray, very fine- grained, silty, argillaceous, noncalcare- ous, sericitic; carbonaceous particles. Clay shale, with some black clay shale, and a trace of coal. Clay shale, with a trace of siltstone. Clay shale, silty; with very argillaceous siltstone. Clay shale, silty; a minor amount siltstone at the top. Clay shale, with some siltstone. Clay shale, with a trace of coal. Clay shale, medium-dark-gray; and me- dium-gray very argillaceous siltstone. Clay shale, with siltstone at 1,100-1,110 ft. Siltstone; grades to clay shale. Sandstone, light-gray, very fine-grained, very argillaceous and silty, noncalcare- ous; some siltstone at the base. .lOgiC de8crlption-Continued Core Depth (feet) Remarks I, 150-1, 160 1,160-1,250 1,250-1,260 1,260-1,290 1,290-1,300 1,300-1,330 1,330-1,340 un 1,340-1,350 1,350-1,370 1,370-1,380 1,380-1,390 1,390-1,410 1,410-1,420 1,420-1,450 1,450-1,470 1,470-1,475 1 1, 475-1, 495 (f) Siltstone, argillaceous; grades to silty clay shale. Clay shale, very silty in upper part; a small amount siltstone at 1,170-1,180 and 1,230-1,240 ft, small amounts black clay shale at 1,180-1,190 and 1,200-1,220 ft, and small amounts medium-light-gray very fine-grained very silty argillaceous micaceous noncalcareous sandstone at 1,200-1,210 and 1,220-1,230 ft. Siltstone, and clay shale. Clay shale, silty at base; a small amount siltstone at 1,260-1,280 ft. Siltstone, medium-light-gray, sandy, argil- laceous, micaceous, noncalcareous; some clay shale. Clay shale, silty in the lower part; siltstone in the bottom 10 ft. Sandstone, medium-light-gray, very fine- grained, very silty and argillaceous, mi- caceous, noncalcareous. Electric log indicates clay shale. Clay shale, with a small amount clay iron- stone, and white very argillaceous bento- nite. Clay shale, with some siltstone in bottom 10 ft. Clay shale with some sandstone, very sericitic. San,dstone, as above; with some clay shale. Clay shale, medium-dark-gray, slightly silty in part, noncalcareous. Top of- Grandstand formation at 1,400 ft~ CÌay shale and siltstone, a small amount sandstone. Clay shale, medium and medium-dark- gray; a small amount siltstone at the top. Clay shale, with some sandstone, and a minor amount siltstone. No sample. Recovered 20 ft: Microfossils very abun- dant. 4 ft 7 in., clay shale, medium-dark-gray, slightly silty, slightly micaceous; rare streaks of argillaceous siltstone and clay ironstone. Fair shaly cleavage indicates that the beds lie fiat. 1 it 7 in., claystone, dark-gray, not silty or micaceous; poor conchoidal fracture. 2 it 3 in., siltstone, medium- to medium- light-gray, sandy in upper part, non- calcareous; many laminae and inter- calations of clay shale. Pelecypod shell fragment from 1,487 ft identified by Ralph W. Imlay as j(i'(W'UlfJ! sp. 7 in., clay shale, medium-dark-gray; inter]aJDinated with medium-light- gray siltstone. Grades into unit below. 460 EXPLORATION.NAVAL PETROLEUM RESERVE NO.4, _SKA, 1944-53 .Li.tho"logic tle8cription-ContiDued .Li.tho"logic tlesoription-ContiDued Core Depth (feet) 2 1,495-1,509 (l) 3 1, 509-1, 525 (J> 4 1, 525-1, 528 Remarks 6 ft 7 in., claystone, medium-dark-gray, silty, noncalcareous; poor conchoidal fracture. 3 ft, claystone, medium-gray, noncal- careous, hard; irregular intercalations of siltstone, some of which have shal- low wavy contacts resembling ripple marks. Grades into unit below. 1 ft 1 in., sandstone, very tine-grained, very argilla.ceous and silty, noncal- careous; abundant faint slightly carbo- naceous and argillaceous laminae which are slightly crossbedded. 4 in., limestone, medium-gray, silty, very arglDaceous, dense. . Recovered 14 ft: Microfossils very abun- dant. 3 ft 2 in., claystone, medium-dark-gray, very silty, noncalcareous, hard; irregu- lar cleavage. Grades into unit below. 5 ft 8 in., clay shale, medium-dark-gray, noncalcareous; shaly to subconchoidal cleavage. Less hard than claystone above. There is a streak of clay iron- stone at the top. 7 in., clay shale, medium-dark-gray; abundant intercalations of medium- light-gray siltstone; both noncalcare- ous. Beds essentially lie fiat. 4 ft 7 in., siltstone, medium-light-gray; interlaminated with medium-dark- gray noncalcareous clay shale; sand- stone laminae in the lower part; some is faintly crossbedded and lenticular. Recovered 16 ft: Microfossils very abun- dant. 1 ft, siltstone interlaminated with clay shale, as above. 4 ft, clay shale, medium-dark-gray, very slightly silty, noncalcareous; fair shaly cleavage indicates that beds lie flat. Grades into unit below. 11 ft, claystone, medium-dark-gray, non- silty; subconchoidal fracture; abun- dant pelecypod shells (including Entoli~m sp. and Arctica? sp., identi- tïea by Ralph W. Imlay) and an actinoptery~an fish skeleton 1 in. 'tOng, identified by David H. Dunkle, U. S. National Museum. Recovered 2 ft 7 in.: Microfossils common. 2 ft 6 in., clay shale, as in core 3. A few small streaks of sandstone in the basal 1 in. of clay shale. 1 in., sandstone, ligh~gray, salt and pepper, tine-grained, argillaceous, non- calcareous; sharp contact with over- lying shale has ripplelike undulations. Co18 Depth (feet) 5 1,528-1, 545 6 I, 545-1, 565 ID Remarks Recovered 17 ft: Microfossils common. 1 ft 5 in., Sandstone, medium-light-gray, tine-grained with a few medium grains, slightly silty and argillaceous, non- calcareous; shaly cleavage (possibly caused by variations in clay content of matrix). Beds lie fiat. Sand com- posed of subangular grains of clear and white quartz with some dark rock fragments and rare carbonaceous par- tioles. 1 ft 5 in., sandstone, as above, but with abundant intercalations and irregular laminae of medium-dark-gray clay shale. Abundant toal~ intercalations and a *in. coal ed are in a 2-in. interval 1 ft below the top of this unit. Grades into unit below. 1 ft, sandstone, as at top of core; poor shaly cleavage. 1 ft 4 in., claystone, medium-dark-gray, silty, micaceous and noncalcareous, in upper part. 3 ft, sandstone, as at the top of the core; poor to fair shaly cleavage. Beds lie flat. Quebracho staininp; suggests fair permeability in the bottom 1 ft. No out or residue was obtained in CCù from 1,533 ft. Effective porosity at 1,533 ft 10.62 percent; the rock is too friable for a permeability test. 1 ft 5 in., sandstone, as above, but more massive and very tine-grained in part; common very tine laminae of coal~ and argillaceous material. 11 in., sandstone, as at top of core. 1 ft 6 in., sandstone, tine-grained, some very tine grains; intercalations; lam- inae and rare thin beds of argillaceous, micaceous, and coaly material as in the 1 ft 5-in. bed above. The top 3 in. of sandstone is medium dark gray be- cause of a concentration of carbon- aceous particles. 7 in, sandstone, as at top of core. 3 ft 3 in., sandstone, as in 1 ft 6-in. bed above. A sample from 1,543 ft had no cut or residue in CC4. Effective porosity at 1,543 ft 12.62 percent; the rock is too friable for a perme- ability test. 1 ft 2 in., sandstone, as at top of core. Recovered 19 ft 9 in.: Microfossils com- :mon in claystone. 2 ft 4 in., claystone; grades to clay shale with poor shaly cleavage; both are medium dark gray, noncalcareous, slightly micaceous, and silty in upper part. ~, Core Lithologic deSCTil't.continued Depth (teet) Remarks (§) @ ~ 7 1,565-1,583 - - u 1, 583-1, 590 1, 590-1, 634 __u 1,634-1,640 1,640-1,645 8 1, 645-1, 665 17 ft 5 in., sandstone, medium-light-gray, very fine- and fine-grained, noncal- careous; fair shaly cleavage, as at top of core 5. Quebracho staining sug- gests fair permeability at 1,548-1,552 and 1,559-1,560 ft. No cut or residue of oil was found in CC4 at 1,553 it; a yellowish greasy stain was present as a residue at 1,563 ft, but no cut was noticeable at that depth. At 1,553 ft effective porosity 18.88 percent and air permeability 305 millidarcys; at 1,563 it effective porosity 11.05 per- cent, and the rock is impermeable. Recovered 18 ft: Microfossils abundant. 9 in., sandstone, as in core 6 above. 1 ft, claystone, medium-dark-gray, very slightly silty, noncalcareous; pyritized wood fragment. 5 ft 3 in., sandstone, as in core 6 above, very fine- to fine-grained; poor shaly cleavage in the upper part, good in the lower part; thin streaks and inter- calations of medium-dark-gray clay shale. No cut, but a yellowish greasy stain was recovered in CC4 at 1,570 ft. Effective porosity at 1,570 ft 16.44 percent; the rock is too friable for a permeability test. 9 ft 8 in., clay shale, medium-dark-gray, interbedded and interlaminated with light-gray fine-grained sandstone and medium-gray siltstone, in approxi- mately equal proportions. Laminae range from very even to very irregular and lenticular. Beds lie essentially flat. 1 ft 4 in., sandstone, as at top of core. Clay shale, silty; with fine-grained slight- ly silty sandstone, very slightly sericitic in part, as in cores above. Clay shale, dark- to medium-dark-gray, silty and very slightly silty. There is a trace of very fine-grained very slightly argillaceous nonmicaceous sandstone with sugary texture at 1,610-1,620 ft. Clay shale; with some medium-light-gray very fine- to fine-grained very slightly silty noncalcareous sandstone; grains are composed of clear quartz with some white quartz. Sandstone, as in sample above. Recovered 20 ft: Microfossils abun~ant. 6 in_, claystone, medium-dark-gray, non- calcareous; silty laminae. 12 ft 8 in., sandstone, as at base of core 6. Quebracho staining suggests fair per- meability through most of this section except the lower 1 ft which shows no stain. A very faint cut and faint greasy stain were obtained in CC4 at , . . . ....L Coni _logiC description-Continued Depth (feet) Remarks 9 1,665-1,670 1, 670-1, 710 1,710-1,715 1,715-1,716 10 1,716-1,736 @ __.__ 1,736-1,790 _u_ 1,790-1,800 1,800-1,810 1,810-1,820 1,820-1,830 1, 830-1, 870 _ _ u 1, 870-1, 875 1,649 ft. Effective porosity at 1,649 ft 13.06 percent; the rock is too friable for a permeability test. At 1,654 ft effective porosity 13.89 percent and air permeability 8.5 millidarcys. 6 ft 10 in., claystone, medium-dark-gray, slightly silty in part; upper one-third has scattered intercalations of silt- stone showing swirly bedding. Frac- ture irregular. Recovered 6 in: Microfossils abundant. Claystone, as at base of core 8. Clay shale, medium-dark-gray, very slightly silty. Clay shale, with some sandstone, medium- light-gray, fine-grained, silty, noncal- careous; composed of clear and white quartz with some rock fragments. Sandstone, as above. Recovered 17 ft 6 in.: Microfossils common. 11 ft 2 in., sandstone, medium-light- gray, very fine- to fine-grained, very silty and argillaceous, slightly calcare- ous in part, massive. Sand ~ pëÍsed of subangular grains of clear and white quartz, with some dark rock fragments and rare carbonaceous par- ticles. Slight variations in carbona- ceous particles and argillaceous ma- terial cause faint very fine laminae through most of the section. Between 1,728 and 1,729 it is a section of medium-gray slightly carbonaceous siltstone, with a I-in. bed of very carbonaceous black siltstone 6 in. from the top. A very faint cut and very pale-yellow residue were obtained in CC4 from 1,719 ft. Effective porosity and air permeability at 1,719 ft 6.77 percent and <lmillidarcy,respectively. 6 ft 4 in., cl8.ystone, as in cores 8 and 9. Siltstone lenticles present in upper 3 ft. Clay shale, medium-dark-gray, very slightly silty; silty streaks in shale in bottom 10 ft. Siltstone, medium-gray, sandy, noncal- careous; a minor amount clay shale and a trace of white slightly argillaceous bentonite. Clay shale, siltstone, with a minor amount sandstone. Siltstone, sandy; and silty siltstone, with some clay shale. Clay shale, with some sandy siltstone, and a trace of silty sandstone. Clay shale, medium-dark-gray, very slightly silty to silty; a minor amount sandstone and siltstone at 1,860-1,870 ft. Sandstone, as in core 11 below; some clay shale. 462 EXPLORATION . NAVAL PETROLEUM RESERVE NO.4, .SKA, 1944-53 Lithologic 4eacriptio_Continued LithoZogic 4escription--Continued Core Depth (feet) 11 1,875-1,895 ~ 12 1,895-1,915 f[J 13 1,915-1,935 (V RelDal'ks Recovered 20 ft: Microfossils rare. 2 ft 4 in., sandstone, as at the top of core 10, but very fine-grained in the top 8 in., below which is a 3-in. bed of medium-dark-gray claystone. 2 it 8 in., CIaystone,medium-dark-gray, interbedded with medium-gray faintly laminated siltstone. Beds are 2 to 8 in. thick, with equal proportions of siltstone and claystone. 7 ft, claystone, as in core 10; bút with subconchoidal fracture in the basal 2 ft. 1 ft 2 in., clay shale, medium-dark-gray; similar to claystone above but with fair shaly cleavage. Beds lie essen- tially flat. 6 ft 10 in., sandstone, as in core 10; very faint cut and pale-yellow residue in CC4 at 1,889 ft. At 1,894 ft the effective porosity 14.22 percent, air permeability 18 millidarcys. Recovered 19 ft 6 in.: Microfossils very rare. Sandstone, as at base of core 11; but with poor shaly cleavage and rare intercalations of clay shale in lower part. Quebracho staining suggests fair peññëãiíiUty in top 1 ft and from 1,899 to 1,901 ft. No cut was ob- tained, but a greasy stain was obtained from 1,898 ft, a faint greasy stain from 1,904 ft, and no stain from 1,914 ft.. A very faint odor was noticed at 1,898 and 1,904 ft. Depth (feet) Effective parœ- Air permeability ity (percent) (mlli1darcys) 1,898_______________ 1,904... ___ ___ _ ___ _ ___ 1,914..______________ 12.10 13.61 12.10 Recovered 18 ft: Microfossils absent. Sandstone, medium-light-gray, fine- grained, silty and argillaceous, slightly calcareous from 1,927 to 1,930 ft, and non calcareous elsewhere, massive; with rare faint slightly darker slightly more argillaceous sandstone laminae that are crossbedded in some places. In the upper half of the core, some units that are 2 to 6 in. thick and 1 to 3 ft apart show quebracho staining, which suggests better permeability for these units than for most of the sandstone. Beds lie approximately flat. The sandstone composed of subangular commonly frosted grains of clear quartz with some white quartz and 11.5 32 25 ø Core Depth (feet) 14 1,935-1,955 flJ ---- 1, 955-1, 970 1,970-1,977 ---- 15 1,977-1,997 Remarks rare dark rock fragments. Some grains have unweathered overgrowths of clear quartz, giving them a sub- hedral shape. Depth (feet) Effective paras- Air permeability ity (percent) (millidarcys) 1,917_______________ 1,920_______________ 1,920_______________ 1,928_______________ 7.36 Impermeable. 7.84 < 1.' 10. 01 Too friable. 1 8.33 < 1. 1 Core stained by quebracbo. Recovered 19 ft: Microfossils very abun- dant. 4 ft, sandstone, as in core 13 above; irregular scattered intercalations of clay ironstone; carbonaceous and argillaceous material between 1,937- 1,938 ft. 3 ft 3 in., sandstone, as above but slightly coarser; a H-in. interval at top contains abundant small streaks of clay ironstone and carbonaceous ma- terial. Basal 1 in. of sandstone is very fine grained. At 1,940 ft effec- tive porosity 13.45 percent, and the air permeability 24 millidarcys. 11 ft 9 in., claystone, medium-dark-gray, noncalcareous, slightly silty; irregular fracture; thin (less than 1 in.) beds of medium-gray siltstone in upper 6 in. and fine siltstone laminae in upper 1~ ft. Clay shale, rarely slightly silty. Sandstone, fine-:grained, salt and pepper, silty, argillaceous, noncalcareous. Recovered 19 ft 6 in.: Microfossils absent. Sandstone, medium-light-gray, fine- grained, silty, argillaceous, noncal- careous; massive except for a 6-in. bed at 1,988 ft that contains com- mon carbonaceous partings. Que- bracho staining in the upper 6 ft šü'g- gests slightly better permeability in that part of the core. Sandstone becomes slightly finer, very argillace- ous and silty 'with depth. The sand is similar to that in core 13, but has fewer subhedral grains and more white quartz. 8; Depth (feet) Effective parœ- Air permeability ity (percent) (millidarcys) 1,978_______________ 1,985_______________ 1,992_______________ 2. 77 Impermeable. 11. 76 3.8. 8.28 Impermeable. '1. .. ,1" ... .LLS, . 'Ioo&U.A....... LAJU!j A.J.'o JJ nUL.. \.-.it. . A A.tt. A , ALA A.A Lithologic deScrip,-COntinUed Core Depth (feet) Remarks ø 1f t-3 (' {).jv"" 17 qtl (Jy - ij) 16 1,997-2,014 2,014-2,017 2,017-2,033 19 2, 033-2, 037 20 2,037-2,057 ding-plane breaks. The sand is com- posed of subangular grains of clear quartz with some white quartz and dark rock fragments. At 2,042 ft. effec- tive porosity 4.44 percent, and rock impermeable; at 2,050 ft porosity 10.6 percent, and permeability < 1 milli- darcy. 21 2,057-2,076 Recovered 15 ft: Microfossils very rare. Sandstone, as in core 20, slightly cal- careous in part; shaly cleavage f~ -!;o60 to 2,063 ft. Beds lie fiat. Below 2,063 ft the sandstone is more massive but bas common carbonaceous and argillaceous laminae, some which show slight crossbedding. A I-in. bed of medium-dark-gray silty car- bonaceous claystone is 2 ft above the base of core. At 2,062 ft effective porosity 11.97 percent, and rock is too friable for a permeability test. ____ _2,076-2,095 Clay shale, medium-dark-gray, slightly silty in part; a very small amount of very fine-grained sandstone in the upper half. _n_ _2,095-2,113 Sandstone and ("lay shale. 22 2,113-2,133 Recovered 20 it: Microfossils absent. 1 ft 3 in., sandstone, as above; common to abundant coaly streaks and part- ings. 18 ft 9 in., sandstone, medium-light-gray, very fine- to fine-grained, very silty and argillaceous, slightly calcareous in part, massive. Fine even carbona- ceous laminae between 2,117 and 2,118 ft show some cross-bedding. At 2,120 and 2,129 ft effective porosity 5.75 and 3.48 percent, respectively; rock is impermeable at both depths. 23 2,133-2, 138 Recovered 5 ft: Microfossils absent. Sandstone, as in core 22; at 2,137 ft effective porosity 11.50 percent, and air permeability < 1 millidarcy. 24 2, 13ß-2, 156 Recovered 18 ft: Microfossils absent. Sandstone, medium-light-gray, very fine- grained., very silty and argillaceous, noncalcareous, massive, uniform. The sandstone is composed of angular to subangular grains of clear and white quartz, with some gray and dark rock fragments. Grain surfaces are com- monly frosted. Carbonaceous par- ticles and subhedral quartz grains are very rare. At 2,139 and 2,148 ft effective porosity 3.43 and 3.61 per- cent, respectively; rock is imper- meable. 25 2,156-2,158 Recovered 2 ft: Microfossils absent. Sandstone, as in core 24. At 2,157~ft effective porosity 3.05 percent, and ... """"..hility <1 milli"r'Yo ') .. ~~cf-dJÇ~J¡-Í1 ~~ {}jJ~'VJ(J-:2rJa -:.: Recovered 17 ft: Microfossils absent. Sandstone, as in core 15; grades from fine to very fine grained with depth. At 2,000 ft and 2,007 ft effective porosity 5.27 and 4.98 percent, re- spectively; the rock at both depths is impermeable. Recovered 3 ft: Microfossils absent. Sandstone, medium-light-gray, very fine- to fine-grained, massive, noncalcare- ous: at 2,015 ft effective porosity 2.52 percent, and rock is impermeable. Recovered 16 ft: Microfossils absent. 12 ft, sandstone, medium-light-gray, very fine-grained., very silty and ar- gillaceous, noncalcareous, massive. At 2,021 ft is a layer of rounded to well-rounded pebbles, ~ to 1~ in. in diameter, composed of black and gray chert, light-gray hard noncalcareous sandstone, and one pebble of red and dark-green chert. A 4-in. bed of medium-gray very silty claystone is present· 2 ft above the base of the sandstone. At 2,201 ft the effective porosity 3.37 percent, and rock is impermeable. 4 ft, siltstone, medium-gray, interbedded with medium-dark-gray noncalcareous claystone. Beds are 1 to 6 in. thick with approximately equal proportions of siltstone and claystone. Recovered 4 ft: Microfossils absent. 10 in., sandstone, medium-light-gray, very fine-grained, very silty and argillaceous, non calcareous, massive. 6 in., claystone, medium-dark-gray, slightly to very silty; with laminae and intercalations of medium-dark- gray siltstone. 1 ft 6 in., sandstone, light-gray, fine- grained., slightly silty and argillaceous, noncalcareous; with a *in. bed of rounded claystone pebbles in medium- grained sandstone matrix 8 in. below the top. 1 ft 2 in., sandstone, light-gray, fine- grained., silty and argillaceous; but very fine grained., and with thin beds of medium-gray very argillaceous silt- stone in· the upper 6 in. Recovered 20 ft: Microfossils very rare. Sandstone, medium-light-gray, very fine- to fine-grained, slightly argillaceous and silty, noncalcareous; quebracho staining (suggesting fair permeability) and shaly cleavage from 2,039 to 2,047 ft. Beds lie fiat. Above and below those depths the sandstone is more massive, having only a few bed- . ~.J .IOgiC description-Continued Core Depth (feet) Remarks ~ ® ~ 464 EXPLORATIOe NAVAL PETROLEUM RESERVE NO. 4LKA, 1944-53 Lithologic tleBcripticm-ContiDued Litho~ogio tlescriptitm-Contlnued Core Depth (feet) ____ _2, 158-2, 168 ____ _2, 168-2, 182 26 2, 182-2, 197 ß) 2, 197-2, 205 2,205-2,235 2,235-2,241 27 2, 241-2, 261 (i) 28 2, 261-2, 282 Remarks Sandstone, fine-grained, silty, argillaceous, noncalcareous; a minor amount of clay shale. Sandstone, very fine-grained, argillaceous, non calcareous; with clay shale and a small amount of very sandy very slightly calcareous siltstone. Recovered 15 ft: Microfossils abundant. 1 ft, sandstone, as in core 25; faint argil- laceous carbonaceous laminae in the lower 4 in. 14 ft, sandstone, medium-light-gray, very fine-grained, interbedded with medium-dark-gray clay shale; the former grades to sandy siltstone with depth. The sandstone-siltstone beds are from 2 to 18 in. thick, and make up approximately two-thirds of the rock. They are noncalcareous, and commonly contain laminae and part- ings of argillaceous or carbonaceous material. The claystone beds are ~ to 6 in. thick. Beds lie approximately 1lat. Clay shale, and very sandy siltstone. Clay shale, medium-dark-gray, very slightly silty at top. Sandstone, light-gray, fine-grained, silty, argillaceous, noncalcareous; a minor amount of medium-dark-gray clay shale. Recovered 20 ft: Microfossils absent. 6 ft 8 in., sandstone, medium-light-gray, fine-grained, very slightly argillaceous, noncalcareous; shaly cleavage; que- bracho staining suggests fair permea- bility. Rare fragments of carbonace- ous plant remains in upper part. Beds lie flat. At 2,241 ft the effeC- tive porosity 9.66 percent, and sam- ple was too friable for permeability test. 13 ft 4 in., sandstone, medium-light-gray, fine-grained, silty, argillaceous, non- calcareous, massive, uniform; grades to very fine- to fine-grained with depth. Faint laminae, caused by very slight variations in the quantity of carbonaceous particles, are present be- tween 2,252-2,254 ft. At 2,252 and 2,261 ft effective porosity 7.90 and 6.69 percent, respectively; rock at both depths is impermeable. Recovered 21 ft: Microfossils absent. Recovery from this core consists of frag- ments 1 to 4 in. in diameter (except for one a foot long) which were sent to the Fairbanks laboratory in two core boxes, one labelled 2,261-2,271 ft and the other 2,268-2,275 ft. The Oore Depth (feet) 2,282-2,286 2,286-2,300 2,300-2,330 29 2,330-2,349 30 2,34~2,368 Remarks fragments are all medium- to medium- light-gray very fine- to fine-grained silty argillaceous Doncalcareous uni- form sandstone, apparently massive. Sand is composed of angular grains of clear and white quartz, with rare brown and dark rock fragments and rare mica. At about 2,270 ft effective porosity 5.55 percent, and rock is im- permeable. No sample. Clay shale, medium-dark-gray, very silty. Sandstone, medium-gray, fine-grained, salt and pepper; some very fine-grained very silty and argillaceous sandstone; silt- stone in upper part; some clay shale. Recovered 18 ft: Microfossils absent. 1 ft 2 in., sandstone, medium-light-gray, fine-grained, noncalcareous; it is coarser in the upper 2 in.; a 2-in. bed of medium-dark-gray clay shale 7 in. below the top. 3 ft 2 in., sandstone, medium-gray, very fine-grained, noncalcareous; abundant intercalations and partings of carbo- naceous and micaceous material. A I-in. bed of claystone is at the base. 8 in., sandstone; grades from medium- grained at the top to fine-grained at the base. 7 in., claystone, medium-dark-gray, silty, noncalcareous. 1 ft 2 in., sandstone, medium-light-gray, fine-grained, silty, argillaceous, non- calcareous; argillaceous laminae in lower 1 in. 8 in., claystone, as above; with *-in. bed of sandstone near base. 10 ft 7 in., sandstone, medium-light- gray, very fine- and fine-grained, slightly to very silty and argillaceous, noncalcareous, massive. Slight vari- ations in carbon content cause very faint laminae in the upper part of the sandstone. Beds lie approximately 1lat. A 2-in. bed of medium-dark- gray claystone is present at 2,340 ft. Slickensides and white calcite veinlets are present 1 ft above the base of the core; the bottom 1 ft of the core is slightly to very calcareous. At 2,338 and 2,348 ft effective porosity 5.23 and 5.37 percent, respectively; rock is impermeable. Recovered 11 ft: Microfossils absent. 8 in., sandstone fragments, medium- light-gray, very fine- to fine-grained, non calcareous; some slickensided or calcite-coated surfaces. LitAologic de,cription-Continued . Reuwks Coni Depth (feet) 2,368-2,375 2,375-2,385 _u_ 2, 385-2, 480 2,480-2,490 2,490-2,500 2,500-2,510 31 2, 510-2, 530 32 2, 530-2, 547 33 2, 547-2, 567 10 ft 4 in., sandstone, as above; grades to very fine-grained, very silty at base; massive, with breaks dipping 20° to 30°. Scattered fragments and streaks of clay shale are preseDt at 7, 4, 2, and 1 ft above the base of the core. Laminae of clay shale that dip 45° are present 2 ft above the base of the core. Slickensides are 4 ft above the base of the core. Clay shale, with a small amount of silt- stone. Siltstone, medium-gray, very micaceous; minor amounts of clay shale and sand- stone. Clay shale, medium-dark-gray, slightly to very silty in part; a small amount of siltstone at 2,385-2,405 ft, traces of siltstone at 2,415-2,430 and 2,440-2,460 ft, traces of sandstone at 2,415-2,425 and 2,450-2,460 ft Siltstone, medium-gray, very micaceous; a small amount of clay shale. Clay shale; grades to siltstone. Sandstone, fine-grained, non calcareous, ar- gillaceous, silty. Recovered 19 ft: Microfossils absent.. Sandstone, medium-light-gray, very fine- to fine-grained, noncalcareous, mas- sive, uniform; becoming slightly finer grained with depth. Faint carbon- aceous laminae between 3,514-3,515 ft; beds lie approximately flat. Slick- ensides are in the sandstone at 2,521 ft. At 2,511 and 2,521 ft effective porosity 9.50 and 0.25 percent, re- spectively; rock is impermeable. Recovered 17 ft: Microfossils absent. Sandstone, as above; slightly darker and finer grained with depth; grades to medium-gray, very fine-grained, and silty at base. At 2,532 and 2,541 ft effective porosity 4.73 and 4.96 per- cent, respectively; rock is imper- meable. Recovered 20 ft: Microfossils absent. 5 ft 10 in., sandstone, as at base of core 32. Effective porosity at 2,552 ft 2.13 percent; rock is impermeable. 2 ft 2 in., claystone, medium-dark-gray; scattered thin beds and laminae of medium-gray siltstone and very fine- grained medium-light-gray sandstone, which increase in thickness with depth. 12 ft, sandstone, as in core 31; effective porosity at 2,562 ft 1.64 percent; rock is impermeable. Coni 1t1/.01oUic de,criptiOA--Continued Depth ( t) Remarks 34 2, 567-2, 573 Recovered 6 ft: Microfossils absent. 2 ft, sandstone, as. at base of core 33. 9 in., clay ironstone, medium-brown ish- gray, nonsilty, very slightly cal- careous; conchoidal fracture. 3 ft 3 in., sandstone, fine-grained; grades to very fine grained and from light to medium light gray with depth. A ~in. layer of rnedium-dark-gray claystone pebbles is present at top of section, and very tine argillaceous laminae are present in upper part of sandstone. Carbonaceous streaks are present throughout. Beds lie approxi- mately fiat. u__ 2,573-2,585 Sandstone, very fine-grained, very silty, as in core above; minor 8Dlount clay shale in lower part. 35 2, 585-2, 605 Recovered 20 ft: Microfossils absent. 11 ft 9 in., sandstone, medium-light- gray, very fine-grained, silty, argil- laceous, very slightly micaceous, very slightly calcareous, massive. A layer of rounded gray chert pebbles % to * in. in diameter is at 2,588 ft: rare patches of fiat pebbles of medium- dark-gray clay shale are in the lower half of the sandstone. Arctic Con- tractors' well geologist noted that the core bled oil at 2,583-2, 589, 2, 593-2, 594* and 2,595~2,596~ ft. A light-yellow cut and yellow residue were recorded in CCù at 2,589 and 2,596 ft. There is no perceptible difference in the sandstone cores between the intervals which bled oil and those which did not. Samples from 2,589 and 2,596 ft were im- permeable, with effective porosities of 9.31 and 10.50 percent, respectively. 6 in., claystone, medium-dark-gray, slightly silty; lenses of medium-gray siltstone. 5 in., sandstone, as above. 3 in., claystone, as above. 3 ft 2 in., sandstone, as above; bled oil from basal 3 in. 3 ft 11 in., claystone, medium-dark-gray, silty in part, irregular to poor shaly cleavage. 2, 605-2, 615 Clay shale, with a trace of siltstone and white bentonite. 2, 615-2, 625 Siltstone, medium-gray, slightly micaceous, very slightly calcareous; a minor amount of clay shale. _u_ 2,625-2,635 Clay shale; grades to siltstone, with a minor amount of sandstone. 466 EXPLORATION "VAL PETROLEUM RESERVE Lithologic description-Continued NO.4, .' 1944-53 L~thologic description-Continued Core Depth (feet) Remarks ---- 2,635-2,641 2,641-2,661 Sandstone, as in core 36; a trace of siltstone and clay shale. Recovered 20 ft: Microfossils very abun- dant. 8 in., sandstone, as in core 35. 9 in., claystone, as at the base of core 35; abundant laminae of coaly material in bottom 2 in. ] 8 ft 7 in., sandstone, medium-light- gray, fine-grained, silty, argillaceous, very slightly calcareous in part, mas- sive. It is composed of angular grains of clear and white quartz, and dark rock fragments. Most grains are frosted. Abundant intercalations of carbonized plant fragments are present at 2,645 ft and carbonaceous laminae at 2,653 ft. Carbonaceous and argil- laceous laminae are common between 2,658-2,660 ft; they dip 5° or less. Patches of sandy clay ironstone are rare throughout. Sandstone at 2,646 ft had a very pale-yellow cut and light-yellow residue in CCI.; sand- stone at 2,656 ft had a light-yellow cut and yellow residue. 36 Depth (feet) Eftectlve porosity (percent) AIr permeahility (mß1Idarcys) 2,644_______________ 2,646_______________ 2,646_______________ 2,648_______________ 2,650_______________ 2,650_________0000_ 2,654_______________ 2,656_____________00 2.656_______________ 2,658______00_______ 12. 00 12.48 14.00 12.40 8.67 10.96 9.62 7.17 8.17 7.20 4.5. 16.0. 11.5. 8.0. O. <1. O. Too frlahle. O. Too friable. 37 2,661-2,681 Recovered 14 ft: Microfossils very rare. 4 ft, sandstonE', as at base of core 36, but with scattereri coaly laminae which become common to abundant and grade from flat to finely undulating with depth. They dip 20° at the top, but the dip decreases with depth to flat at the base of the sandstone. A few clay ironstone nodules are in laminae in the lower 1 ft. Sandstone at 2,662 ft had a yellow cut and brownish-yellow residue in CCI,; the well geologist reported that the core bled oil from 2,661 to 2,664 ft. At 2,662 ft effective prorosity ] 2.50 per- cent, air permeability < 1 millidarcy. At 2,663 ft they are 12.75 percent and 2.8 millidarcys, respectively. 1 ft 3 in., sandstone, very fine-grained, with very fine even dark laminae Core Depth (feet) Remarks which are the result of variations in quantity of carbonaceous and argil- laceous matter. The laminae dip 30° at the top of the section, but curve gradually so that at the base, where they terminate abruptly against the underlying siltstone, they are nearly vertical (85°-90°) at one side of the core, and about 70° at the opposite side. At the top of the sandstone is a section of claystone, * in. thick on one side, and wedging out on the other, which fills the interval of rock between the flat-lying laminated sandstone above and the 30° dip of the· sand- stone below. 10 in., siltstone, medium-gray, very argillaceous, non calcareous. Streaks of sandstone at the top show swirly bedding. Slickensides are near the top and bottom of the section; most are steeply dipping. The contact at the top of the section is sharp and dips approximately 50° in the oppo- site direction from the steeply dipping laminae of the overlying sandstone. 2 ft 2 in., sandstone, very fine- to fine- grained, very silty and argillaceous; with carbonaceous streaks in the lower part that dip 30° to 60°. The sandstone is calcareous in the lower 1ft. * in., claystone, medium-dark-gray, slightly silty; slickensides parallel the bedding; sharp but irregular contacts are present at top and bottom. 1 ft 2 in., sandstone, medium-light-gray, very fine- to fine-grained, salt and pepper, argillaceous, silty, slightly calcareous; streaks of very fine sand- stone in the upper part. 1 ft 9 in., sandstone, as above; but with coarse carbonaceous particles im- parting an appearance of swirly bed- ding. Streaks (1 to 2 in. wide) of siltstone, and a 1- by 3-in. fragment of clay shale are in the central part of the sandstone, which grades to argil- laceous siltstone and silty shale in in the bottom 2 in. 2 in., siltstone, medium-gray, sharply interlaminated with medium-dark- gray clay shale. Dip 7°. 1 it 9 in., claystone, medium-dark-gray, silty; streaks of argillaceous siltstone. Steeply dipping slickensides present in claystone. Contact with under- lying sandstone is sharp and resembles a ripule mark. TEST WELLS, SQUARE Lithologic de8.-Continued Depth (feet) Remarks Core 46, LAKE AND WOLF CREEK AREAS, ALASKA .thologiC description-Continued 38 2,681-2,701 2,701-2,710 39 2,710-2,730 2, 730-2, 760 2,760-2,770 2,770-2,780 2,780-2,810 10 in., sandstone, medium-light-gray, very fine- to fine-grained, slightly calcareous; patches and small streaks of carbonaceous material and clay shale. A *in. bed of abundant clay intercalations 2 in. below the top of the sandstone contains abundant Inoceramus shell fragments and one white quartz pebble * in. in diameter. jRecovered 15 ft 6 in.: Microfossils rare. 4 in., sandstone, medium-light-gray, very fine-grained, argillaceous and silty; very faint argillaceous silty laminae. Beds lie flat. 1 ft 8 in., clay shale, medium-dark-gray, noncalcareous; small lenses (1 to 2 in. thick) and laminae of medium-gray siltstone with sharp contacts resem- bling ripple marks. Beds lie flat. 1 ft 8 in., siltstone, medium-gray, very argillaceous, calcareous, faintly lam- inated; rare very thin ~ in. thick) beds of clay shale near the base. 4 ft, clay shale, as above. 7 in., sandstone, as above; grades to medium-gray sandy siltstone at base. 3 ft, claystone, medium-dark-gray, non- calcareous; irregular fracture. 3 ft, clay shale, as above; but with slightly thicker siltstone lenses. 1 ft 1 in., sandstone, as above; but very silty in upper 2 in. Laminae dip 3°. 2 in., clay shale, as above. Sandstone, as in core above; with clay shale. Recovered 10 ft: Microfossils absent. Sandstone, medium-gray, very fine- to fine-grained, silty, argillaceous, slight- ly micaceous, slightly calcareous in part, massive. A I-ft bed 3 ft above the base is very silty and has argil- laceous carbonaceous laminae at top and bottom. Sandstone is composed of angular to subangular commonly frosted grains of clear and white quartz, with scattered dark rock fragments. A sample from 2,720 ft had no cut and only a faint greasy stain as residue in CC4. At 2,720 ft effective porosity 7.05 percent; rock is impermeable. Sandstone, medium-light-gray, argil- laceous, non calcareous. Clay shale. with trace of siltstone. .~ ~oruk formatio~~i..~~º"J!~ Siltstone, with some clay shale. Clay shale,' with good shaly cleavage, and some sandstone, salt and pepper. silty, Core Depth (feet) Remarks 2,810-2,820 2,820-2,830 40 2,830-2,850 __u 2, 850-2. 880 ____ 2,880-2,900 ____ 2,900-2,980 2,980-3.000 3.000-3,010 3,010-3.028 41 3, 02~3, 048 slightly calcareous; fine grained a.t top, very fine grained in lower part. Sandstone, very fine-grained; and ciay shale. Sandstone, very fine- to fine-grained; a small amount clay shale. Recovered 17 ft 6 in.: Microfossils absent. 7 ft 6 in., claystone, medium-dark-gray, slightly silty in part; poor shaly cleavage to subconchoidal fracture. A 4-in. bed of light-gray fine-grained sandstone 3 ft below the top is very calcareous and contains Ditrupa sp. shell fragments at the top. A bed of medium-light-gray very fine-grained calcareous sandstone 7 in. thick, with faint flat-lying laminae, is 4* ft below the top. Claystone contains rare siltstone lenticles. 2 ft 6 in., sandstone, medium-light-gray, very silty and argillaceous, calcareous; faint carbonaceous argillaceous la- inae in lower part dip 5° or less. Fragments of medium-dark-gray clay shale are abundant in ~-in. and I-in. beds in the lower half of the sandstone. 7 ft 3 in., claystone, as above; a 100in. bed of very fine-grained sandstone as above which has a *in. bed of claystone in the center and a ~-in. bed at base. 3 in., claystone, as above. Sandstone, medium-light-gray, very fine- grained, silty, argillaceous, slightly cal- careous; a small amount of clay shale in the lower part. Clay shale. medium-dark-gray, very silty; grades to medium-gray very argillaceous siltstone with a minor amount of sandstone. Clay shale, very silty in part; a minor amount of siltstone at the base and top, and some bentonite at 2,900-2,910 ft. Clay shale; grades to siltstone. Clay shale, with a minor amount of sandstone. Sandstone, very fine-grained, silty, argilla- ceous, noncalcareous; a small amount of clay shale at the top. Recovered 14 ft: Microfossils rare. 2 ft 6 in.. sandstone, medium-light-gray, very fine- to fine-grained, argillaceous, silty, very slightly calcareous in part; scattered small streaks of medium- dark-gray clay. 6 in., siltstone, medium-gray, very sandy, very finely laminated; with a *in. bed of clay shale in the upper part. Grades into unit below. EXPLORATION &AVAL PETROLEUM RESERVE NO. 4, ~KA, 1944-53 Lithologic description-Continued Lithologic description-Continued 468 Core Depth (feet) Remarks 3,048-3,080 3,080-3,092 42 3, 092-3, 112 3,112-3,120 3,120-3,160 3,160-3,210 nu 3,210-3,280 __ __ 3, 280-3, 293 1 ft, sandstone, as above; but with more numerous streaks (up to 3 in. long) of clay suggesting swirly bedding. A2-in. bed of clay shale is at the bottom of the sandstone. 10 ft., sandstone, medium-light-gray, very fine-grained, very argillaceous and silty, noncalcareous; some fine- grained sandstone; a few thin (1 to 2 in.) beds with faint rarely crossbedded laminae. Thin beds O~ to 2 in. thick), streaks, and intercalations of clay shaJe are throughout and increase gradually in size and abundance with depth. Small rounded bodies of sand- stone (~ to 1 in. across, and ~ to ~ in. thick), with the same composition as the rest of the sandstone, are outlined by slightly darker and slightly more argillaceous matrix. They are in groups or singly through the sand- stone, with their long axes parallel the bedding. Clay shale, medium-dark-gray; becomes very silty with depth. Sandstone, very fine-grained, argillaceous and silty, slightly calcareous in part. Recovered 20 ft: Microfossils absent. Sandstone, medium-light-gray, very fine- grained, very argillaceous and silty, slightly calcareous in part, massive; rarely faintly laminated. At 3,109 ft effective porosity 2.40 percent, and rock is impermeable. A 6-in. bed of interbedded medium-dark-gray clay shaJe and sandstone, with individual beds ~ to ~ in. thick, is at 3,097 ft; 6 in. below this is a 5-in. bed of medium - dark - gray non calcareous slightly silty and micaceous claystone. A 4-in. bed of sandstone 1 ft above the base of the core contains a few thin intercalations of clay shale. Ditrupa sp. fragments are common throughout the core; pelecypod shells are also present, and a small fragment of an ammonite was found at 3,095 ft. Siltstone, very sandy; similar to sandstone above; some clay shale. Sandstone, very fine-grained, slightly cal- careous; a small amount of clay shale. Sandstone, as above; but with more clay shale, which increases to 50 percent with depth. Clay shale, medium-dark-gray, slightly silty; a minor amount of medium-light- gray slightly sandy very slightly cal- careous siltstone at the top. Clay shale and sandstone, medium-light- gray, very fine-grained, very silty and Core Depth (feet) Remarks 43 3, 293-3, 313 3,313-3,320 3,320-3,330 3,330-3,350 _ _ _ _ 3, 350-3, 358 44 3, 358-3, 378 argillaceous, slightly calcareous; a minor amount of pale-blue-green slightly argil- laceous and silty bentonite. Recovered 20 ft: Microfossils common. 2 ft 2 in., siltstone, medium-gray, very sandy, slightly calcareous; abundant intercalations of claystone totaling about one-fourth of the rock. 1 ft 11 in., siltstone, as above; but faintly laminated and lacking clay. . 1 ft 2 in., siltstone, as at top of core. 2 ft 8 in., siltstone, medium-light-gray, slightly calcareous; carbonaceous mica- ceous laminae which give good shaJy cleavage to the rock. 7 ft 1 in., siltstone, with clay intercala- tions as at the top of the core. 6 in., clay shale, medium-dark-gray, slightly silty; poor shaly cleavage. 1 ft 5 in., siltstone, medium-gray, very sandy and argillaceous, calcareous, massive. 3 ft 1 in., siltstone, as at top of core. Siltstone, with clay shale, and a small amount of sandstone. No sample. Clay shale; grades to siltstone, with a very small amount of fine-grained sandstone at the base. Sandstone, medium-light-gray, very fine- to fine-grained, silty, argillaceous,!mica- ceous, slightly calcareous. Recovered 20 ft: Microfossils"absent. 2 ft 2 in., sandstone, mediu~-light-gray, fine-grained; slightly calcareous at the top grading to very calcareous at the base. Scattered intercalations of car- bonaceous and argillaceous j material suggest a dip of 5° or less. 4 in., claystone, medium-dark-gray, non- silty, very slightly:calcareous in part; irregular fracture. 1 ft 6 in., claystone, medium-gray, non- silty, noncalcareous; conchoidal frac- ture. 2 ft 1 in., claystone, medium-dark-gray, slightly calcareous, slightly silty. 12 ft 3 in., sandstone, medium-light-gray, fine-grained; grades to very fine- grained at base, silty, argillaceous, slightly calcareous to calcareous, slightly micaceous, massive. Rounded shale pebbles 1 in. in diameter are in a 2-in. bed at 3,362 ft with a few small «1 in.) intercalations and pebbles of clay shale at 3,369-3,370 ft. At 3,368 ft effective porosity 3.23 percent, and carbonate content 22.35 percent by weight; at 3,373 ft they are 4.00 and 28.5, respectively. Both samples are impermeable. TEST WELLS, SQU.ABE 469 Core Lithologic descript.Continued Depth (feet) Remarks LAKE AND WOLF CREEK AREAS, ALASKA .logic description-Continued Core Depth (feet) Remarks ---- 3,378-3,400 3,400-3,410 3,410-3,470 nn 3,470-3,490 3,490-3,494 45 3,494-3,514 46 3, 514-3, 532 3,532-3,540 3,540-3,550 _ n _ 3, 550-3, 560 1 ft 8 in., siltstone, medium-dark-gray, very sandy and argillaceous, very slightly calcareous; abundant carbo- naceous and biotite particles. Clay shale, medium-dark-gray, silty; and medium-gray siltstone; grades to me- dium-light-gray very fine-grained slightly calcareous to calcareous sand- stone. Clay shale, with some siltstone. Clay shale, medium-dark-gray, slightly silty in part; slightly calcareous at 3,450-3,460 ft. Clay shale with minor amounts of medium- gray very argillaceous siltstone, and a trace of sandstone. No sample. Recovered 17 ft 6 in.: Microfossils very rare. 2 ft 7 in., sandstone, medium-light-gray, very fine-grained, silty, argillaceous, calcareous. Groups of rounded clay shale pebbles are present 1 ft and 2 ft below the top of the core. Pebbles range from small flakes to 2 in. in diameter. 3 ft 3 in., claystone, medium-dark-gray, silty, very slightly calcareous; irregu- lar fracture. Rare thin 0' to 1 in.) cross bedded beds of siltstone. 8 in., siltstone, medium-light-gray, slightly calcareous; faint laminae give fair shaly cleavage; grades to very fine-grained very silty and argillaceous sandstone at base. 2 ft 3 in., claystone, as above, very silty. 8 ft 9 in., sandstone, very fine-grained, argillaceous, silty, calcareous, massive, uniform. Nearly vertical (88° or 89°) fractures, with patches of aragonite coating, split the sandstone core longi- tudinally for most of its length. At 3,509 ft effective porosity 5.5 percent, rock is impermeable, carbonate con- tent 27.4 percent by weight. Recovered 8 ft: Microfossils absent. 6 ft 4 iIi., sandstone, medium-light-gray, very fine-grained, silty, argillaceous, slightly calcareous, massive. At 3,520 ft effective porosity 6.89 percent, the carbonate content 16.12 percent by weight, and rock is impermeable. 1 ft 8 in., claystone, medium-gray, very silty, calcareous. Clay shale, medium-dark-gray, noncal- careous; a small amount of sandstone. Sandstone, medium-light-gray, very fine- grained, calcareous; a very small amount of clay shale. Clay shale and sandstone. 3, 560-3, 570 Sandstone, with some clay shale, and a trace of pa1e-yellowish-white bentonite. 3, 570-3, 580 Clay shale, with a small amount of sand- stone, and a minor amount of siltstone. 3,580-3,680 Clay shale, medium-dark-gray, slightly silty in part; common streaks of me- dium to medium-dark-gray very argil- laceous slightly calcareous to calcareous siltstone. n __ 3, 680-3, 740 Clay shale, medium-dark-gray, very slightly silty, noncalcareous; rare thin streaks of very argillaceous siltstone. 47 3,740-3,760 Recovered 12 ft 6 in.: Microfossils com- mon. Claystone, medium-dark-gray, very slightly micaceous and silty, noncal- careous; irregular cleavage. Claystone between 3,742-3,747 ft badly broken and infiltrated with drilling mud; many of the fragments have slicken- sided suñaces. A fiat-lying silt lam- ina one-quarter inch thick is at 3,755 ft. Pelecypod shell impressions scat- tered throughout include specimens identified by Ralph W. Imlay as Thracia ct. T. kis,oumi McLearn and Inoceramus sp. juv. ct. 1. anglicus Woods. CORE ANALYSES Samples from cores taken from Wolf Creek test well 3 were tested for porosity and permeability by methods described on page 441, and a few of the samples were analyzed for carbonate content. Results of these:tests are given in the followin :t table. Analyses of core ,ample. from Wolf Creek teat tDeU S Depth (feet) Elfeetlve ~ AIr permeability (mIIJ1darcys) 1,533__ __ ____ _ _____ _ ______ 1,543_____________________ 1,553_____________________ 1,563_____________________ 1,570_____________________ 1,649_____________________ 1,654_____________________ 1,719_____________________ 1,894_____________________ 1,898_____________________ 1,904____________________ 1,914____________________ 1,917__ ____ _________ ___ ___ 1,920__ __ ____ ________ _ ____ 1,920_____________________ 1,928_____________________ 10.62 12. 62 18. 88 11.05 16. 44 13. 06 13. 89 6. 77 14. 22 12. 10 13. 61 12. 10 7.36 7.84 10.01 8. 33 Too friable. Too friable. 305. O. Too friable. Too friable. 8.5. <L 18. lL 5. 32. 25. 0. <L Too friable. <L Simpson Seeps: 34 core tests; a shallow oilfield was defined by the series of core tests. . Square Lake: 1 test well; a prospect n 'est of Umiat defined _ by seismic and photogeologic techmques. Titaluk River area: 1 test well; located on an anticline mapped primarily by field and photogeologic methods. Topagoruk River area: 2 test wells; in the central part of the coastal plain; a deep test penetrated rocks ranging in age from Devonian to Pleistocene. Umiat: 11 test wells; many produced oil. Wolf Creek area: 3 test wells; relatively shallow tests; shows of gas. The test holeg range in depth from 47 to 11,872 feet, and the drilling penetrated rocks of Paleozoic, Mesozoic, and Quaternary age. Most of the footage was drilled of Cretaceous rocks, and all the oil-bearing beds found are in this age. Figure 3 shows diagram- matically the relationships of the Cretaceous rocks. Paleozoic, Triassic, and Jurassic sedimentary rocks were penetrated in the drilling of a few holes in the northern part of the Reserve, but only a small amount a:: .... a... a... => II> => 0 .... u < I- .... '" '" a:: "'~'" 3011. 0·11. U ~ :J +- a:: IJJ 3: o -' FORTRESS MOUNTAIN TOROK FORMATION FORMATION -----------------------? ?------------ LOWER CRETACEOUS (? )ANO uPPE!i: JURASSIC(?)ROCKS. UNDIFFERENTIATED OKPIKRUAK FORMATION UNITS OF JURASSIC AGE -? - Not known \ of gas was foUnd in these older rocks. Oilfields ': discovered at UnAand Simpson seeps and gasß at Barrow and GJIr. Some shows of oil or gas... ____ also noted in other holes. The United States Geological Survey participated in the program as a cooperating agency. Drill cores and cuttings from the tests were shipped from the reserve to the Suryey laboratory in Fairbanks where they were processed, described, and analyzed. De- tailed subsurface information based on laboratory studies and analyses by the authors has been compiled by groups of related wells; in addition, logistic, engineer- ing, and drilling operational data have been abstracted from the files and reports made to the Navy by Arctic Contractors, United Geophysical Co., Inc., the Schlumbèrger Well Surveying Corp., the U. S. Bureau of Mines, and the National Bureau of Standards. These data as well as a geological interpretation of the sub- surface information constitute this paper. ARCTIC COASTAL PLAIN PROVINCE Sentinel Hill member SCIiRAOER Barrow Trail member BLUFF ---------- FORMATION Rogers Creek member Ayryak member SEABEE FORMATION NINULUK FORMATION GRANOSTAND FORMATION TOPAGORUK FORMATION ?---------'---- OUMAlI K FORMATION Relationship of these rocks to thosa to the south is unknown Predominantly marine Predominantly nonmal"lne FIOUBB 3.-Nomenclature of the Cretaceous rocks of northern Alaska. 7-4 Simpson Seeps: 34 core tests; a shallow oilfield was defined by the series of core tests. . Square Lake: 1 test well; a prospect n est of Umiat defined by seismic and photogeologic techD ea. Titaluk River area: 1 test well; located on an anticline mapped primarily by field and photogeologic methods. Topagoruk River area: 2 test wells; in the central part of the coastal plain; a deep test penetrated rocks ranging in age from Devonian to Pleistocene. Umiat: 11 test wells; many produced oil. Wolf Creek area: 3 testwells; relatively shallow tests; shows of gas. The test holes rarige in depth from 47 to 11,872 feet, and the drilling penetra>ted rocks of Paleozoic, Mesozoic, and Quaternary age. Most of the footage was drilled of Cretaceous rocks, and all the oil-bearing beds found are in this age. Figure 3 shows diagram- matically the relationships of the Cretaceous rocks. Paleozoic, Triassic, and Jurassic sedimentary rocks were penetrated in the drilling· of a few holes in the northern part of the Reserve, but only a small amount II: "" a.. a.. ::> '" ::> 0 "" Co) -< ... "" II: II: It: ...."... ~co. 0·0. U ... :> -?-- II: "" ~ o ..J FORTRESS TOROK MOUNTAIN FORMATION FORMATION -----------------------? ?------------- LOWER CRHACEOUS(?)ANO UPPER JURASSIC(?)ROCKS, UNDIFFERENTIATED OKPtKRUAK FORMATION ? UNITS OF JURASSIC AGE - Not known Predominantly marine FIf1URB 3.-Nomenclature of the Cretaceous rocks of northern Alaska. Predominantly nonmanne of gas was found in these older rocks. Oilfields \ discovered at UmAand Simpson seeps. and gas~ at Barrow and G_. Some shows of oil or gas ~___ also noted in other holes. \ The United States Geological Survey participated in the program as a cooperating agency. Drill cores and cuttings from the tests were shipped from the reserve to the Suryey laboratory in Fairbanks where they were processed, described, and analyzed. De- tailed subsurface information based on laboratory studies and analyses by the authors has been compiled by groups of related wells i in addition, logistic, engineer- ing, and drilling operational data have been abstracted from the files and reports made to the Navy by Arctic Contractors, United Geophysical Co., Inc., the Schlumbêrger Well Surveying Corp., the U. S. Bureau of Mines, and the National Bureau of Standards. These data as well as a geological interpretation of the sub- surface information constitute this paper. ARCTIC COASTAL PLAIN PROVINCE Sentinel Hill member SCHRADER ------------ Barrow Trail member BLU FF - - -------- FORMATION Rogen Creek member Ayiyak member SEABEE FORMA nON NINULUK FORMATION GRANDSTAND FORMATION TOPAGORUK FORMATION ?----------'----- OUMAU K FORMATION Relationship of these rocks to those to the south is unknown . . UNITED STATES DEPARTMENT OF THE INTERIOR GEOLOGICAL SURVEY Fairbanks. Alaska Dec. 30. 1952 Mrs. Helen N. Loeblich 34?2~ebec Street. N. W. Washin.gton. D. C. Dear Helen: I Enclosed are the final written and graphic logs tor Wolf Creek Test Well No.3. (copy No. 23)- Sincerely. ~~ Ethel M. Paulicheck Clerk Encl. 2 ~f' \ rfJ./\ ~ . . F< ::: S T R leT ED FOR 0 F F Ie I A L US E 0 r.J LY co py No.,__2J!~_~..: u. S. GJOLOGIC.AL amYlY Ba"7 Oil Uni t La'borato:q J'airbaDka. Ala*a a.:r Cia !IS! WItaI. 100 3 Thi8 te.' 1. loca~ 485' 4ue WI' ot Wolt Chek fest Well 10.. 1. and is ., w.to 690 239 18" I... Lone. 163° 321 08w W. 1\ 1. on the axia ot tbe Volf Creek aD'1o1111eo a lone DOJ'thwe.t-tr.ncl1nc .tru.ctun ütll1e4 b7 lIUrlac. act pbotopol0&10 "'PptDCo Wolt Creek !ea' Welll 108. 1 'aa4 a are IIhallow tea'a of \he cre.' uti the DOrtbem naù. r..pectiye17. Wolf Cr_ fed Well 10. 3 va_ dri11.ct to ,.., ~ 101M¡' part ot the 8ection. that 18 approU..te17 equivalent to tha proclD.clag ...48 of the Umiat f1eld. I t i. 70' h1gher .tr1JC~1J' ~ fea' W.ll Bo. 1. and approxlma'te17 450' higher tban T..t Well Boo 2. ft1e wet. dr111ed. with a Carclwll r1C. apudde4 on ÄUgI18t 30. 1952; 16· lU'fac. caatac _à ..t at 10"1, With 10 3/.· ca.t... at 63580 1 t was drill.d with aD 011 eal81oa". !he firlt 1475' were DOt coreel. &s tbe .qu1Y- alent section ha4 'been 'e.'e4 ia Volf Creek feat Well. B08. 1 aa.d. 2,. The hole .. abandoned at & toW depth of 3760', on Boy_b.r 3. 1952. at'ar encoWltar1ng oDl7 emall ahow. of _s ('bet.an 15a8' &Del ao'76l) and 011 (betwaD 2585' and 26811)0 Drill.'.. test_ (Jobnaon formaUo~ te.te) ot t... lnt.nal. are 1IWDIIII.I'1ae4 belo". Correla1i1on8 gi"ea below are based on mlC1'ot08111 1denUt1eatlon. .. Harlu Bo Bergquist. ad on lnho1o., 48te1'll1..4 by øaalD&t1ol1 ot cor.., _11 cutUngs, the .lectric 10C. sAd ArcUc Contractor I' Petrol.. Engineer'. aacl GeologI8t'. Reports" Wolf Creek !eat Well 100 3 apvA4ed at a It.lq drlTe bu8h1DC .1eTationot 150'; th. groun4 level va. 181 10"1'. !be fint .'rat'. encountered conet.' of a few fe.t ot 1&114- stone and .hale mlch.., correlat. with Zone" 'beds (Col,,!ll. Group. Upper Cnkoeou.) in Wolf' Creek: fe.t Well. loso 1 aDd 2. although no dl&gDostlc 11 üologr or t08SU.. are pre sen.t 0 Zone B, 50' '-360' - Th. fir., eYi4en.oe of the Gau4z71na A.-Troc-.1Da J t&1lD& Is found at a dept.h of 501 (belov. ltall7 4riTe ba..h1nc trOll vb.1ch all clepthe are measurad.) . fro!'''''-ina'' 1s COIIIIOn &D4 Gaudr.:Y'1pa A rare to 3150'; aD abrupt cleerea.e in 8p8C1mens below Ulat depth .....,. that 1t 11 e..entialq the 'bale ot the fauna, and that .peewe.. found balow 350' are cont_iDation trom aboY.o !he lltholoQ' ot the 1nte"al fro. SO' to 350' co..18t. of al t.maUDg àands'on. and ahale. 1111 th & emall amount of s11t.ton... ~ IaDdstone. which 1. 1n beds 30 'to 50' thick. s. tine to medium gralne4, a1ipU~ .U. . not 81l~. non-calo&reoul1) non-ateaceoulo aad 1s comp08ad ot angular to au.ban¡ular trosted. grains of clear and. vh1~ quartl. grq chert and clark rock tr.....t.. '!he elIal4I 1. med1_ (#8¥o aotte often e11gbt17 calcaraoue. Cl.,- 11'One1;oa.e 1. rare: a trace ot beaton1 te occur. at lSOlo Zone De 350-1475' - From 350' to 600'. BaAdaton.. 10 to 30' thick al ternate with clrq ehale. The eand.1;oae Is ueua1q "'.17 tine ça1nedø sllt7 and argil1aceou.o non- calcareou8. wi 'h a -.11 amount of light-colored mica (aeriel tet). and 18 compo.ed. ot clear and white quarts with rare cber~ an4. rock fr....nt8. !he cla7 ehale ia ..clium dark grqe' non-cal·oareous. and barder than that in Zone E aboveo From 6008 ~ 1475' the 8ect1on. 1s dominated. b7 thi. Qpe of clq shale, wi th 11I&11 aaountB of "ery fine grained sand.etòne.. Streaks ot black ahal. aDd coal occur between '100' and 1000',. . . Clay ironstone 1a Yerv r&1"e; traces of benton1 te are present at 740" and 1350s 0 The sandstone becomes siltier!} and verry m1cacflousQ with increasing depth.. Zone D is almost barren of microfossils. except for ol1e ditch sample a.t 13OQ.=13l0Q in which specimens of Verneuilino1deª 11' and g.aucb7i~ .A. are common.. Zone Be. .- 'D1e f1ret four corel from l475ij to 1528Q are composed of medium dårk grq. non-calcareouI 811 tr cl87 shale that contains the typical Verneui111101def! 11' fauna. TheT are underlain b.Y 60 ø of tine grained. slight17 811 ty It medium 11ght gra:1e very slightly micaceous sandstons tbat 18 cOllpOeed of subangular clear and vhi fie quartz wi th rare chert and roClc tr~n i80 A few thin beds of cl,q- sbale bre_ the continu1 V of the sandstone. A ahow of gas and a fAint cut of oil (1n eel4> wre obtained from thie sandstone.. Lower sanda are fine to verr tine grainedo ran. from 15u to 100' thiCk. and alternate w1 th lot to 100' beds of clq shale or clq stone in approximately equal proportions; mau,y of the sandstones gave cuts of 011 or shows of gas as mentioned above (see also sUJnma17 ot testing "below) 0 Below 2150' the sand- stones are th1nnero finer grained. very silty and argilla.ceous. and slightly calcar- eous; they lack show8 of 011 or gas. 511 tstone becomes more common and clq shale becomes dominant near the bottom ot the 00180 The Verneu111no1des F fauna. 1s prf.Jsent from 1475' and continueø with deoreasing abundance tQ the bottom of the hole (To> D" 3760').. stJMM.\Rf' OF DRILL S~ 9ST~ !~!! De»th Re~yel7 1 152805-1545Q Open 150 min.. modera.te b10,,0 closed in 70 minutes. recovered 70° dril11!l€ mud.. Closed in BHP 50 psi..; flowed rate 174 'HCF/da¥ through :tit choke.. 2 1548-1565u Open 273 m1noo moderate blow~ closed in 10 min. recovered lOa drilling mudo 0108ed in BBP 500 psi.. flowed rate 39408 MCF/dtqo 3 1647-1670° Open 242 min. slight blow increased to light blow after 1 bra; recovered 708 drilling mudo no BHP recorded; flowed rate 14.1 Mer I dq . 4 1878-1915' Open 183 mino 0 very slight blow; c10s84 in 16 mino 0 BBP to 400 psi (not at equilibrium); recovered 230° sl1ght1Jr gas cut mudo some of which entered tool while packer was being spuddedo 5 19?8-2017Ü Open 131 min" 3 cloled in 38 mino. flowing and closed in BBP Bero; recovered 50' drilling mud~ 6 2038=2076' Open 288 ./Din. 0 weak blowo increasing to moderate after 3 Ør8.e closed in 28 min~o BEP 850 psi.. recovered 176 ~ we. tel' cut mudo sa! in1 ty 3135 ppm (mud. 500 ppmh flowed rate 257,,1 MCr/~o through iN orifice. 1 2244-2282u Open 150 mino; no BHP recorded. flow pres8\o1Ze zero; re'covered 141/ drilling mud" 2 . . ¡WIlber ~th 8 2512-2547' 9 2687-2605' 10 26430-2661' Recovery: Open 158 min.. not closed in" no:BB.P recorde~f10w p:re881U"e aero; recovered 6 t drilling mudo Open 270 lDin. 1/ no cas at surface; no :BBP recordecio flov pressure sero; recovered .109 drilling mud" Open 210 min." closed. in $0 mino. BHP buil t up to 450 p.1. (not at equilibriwa); flow pressure sere; recovered. 900 ¡¡ drill1ng mud" through plugged re- ta1niag valva" U 2647-26819 Open 193 mino II ve-q elight blow, closed in 62 mino. flow ana closed in pressure zero; recovered 709 clri11iug mud vi th 2 quarts free 011 OD. top" 12 2644--2681 ' Open æo min" \I very slight blow at su.rface; closed in 60 miA.. closed 1n :BBP sero; 1"scovered 909 oil cut mud. vi th 2 gallons free 011 on top" , -.: !lIS! lOB. OIL STAIB IIi eOl" ~ DG"th .9:!! Reøidu& .......40- b. 5 1533' nODe none 5 1543 none none 6 1553 none yellowish greas,y atain 6 1563 none none .., 1570 none yellowish graa~ stain S .1649 VG17 verT pale faint greaST stain 10 1719 ver1 very pale very pale 1'e110" 11 1889 Te;t7 pale pale yellow 12 1898 BOne greasy stain 12 1904 none faint grsaøy stain 12 1914 none none 15 1978 none very faint geasy stain 16 2000 none none 11 2015 none none ao 2042 J1OJ;l8 very pale 1ellow stain 21 2062 none pale Tallow stain 23 ·2120 none nona 23 2131 none none 24 2148 none faint greasy stain 25 215'1 none faint greasy Bta.in 27 2241 none fain t grea.sy stain 21 2252 none very faint grea.sy staiD 27 2361 nOile very fa.int graaq stain as 2270 none faint greasy· stain 29 2338 straw colored 79110w 29 2348 very pale s tra.v colored yellow 31 2511 none none 31 2521 none greasy IS tatn ;; . . .£g~ ~th .2.!! ae.1due 32 i 2532' none &rea.,. stain 32 ".1 2541 ~a. DOlle 33 2552 none pale '8110w .tam æ 2562 110ne .,err la1n t greaq 8ta1A 36 2589 lip' 7ellow 1.110w 36 2696 ltch' '8110w 1'ellow 36 2646 svaw colored pale 78110w 36 2656 lipt 7e110" Tellow 37 2662 yellow 'browah yellow 39 2.73) DOne faint ...... eta1A COb .AI.ALYSBS ºO~E! . J)g*q mUect1ft Porosity Air Per.",bili" 6 16338 10..6. too triable 5 1643 12.62 too friable .6 l553 18..88 305 1114.. 6 1.S63 11..05 impermeable ? 1570 16.44 too fr1able e 1649 13.06 too triaDle 8 1654 13.89 8.5 m.. 10 in9 6.'17 le.s than 1 lid.. 11 1$94- 14..22 18 m4. 13 1898 12.10 11.5 ado 12 1904- 13..61 32 114", 13 1914 12.10 25 md.. .13 191'1 1.36 impermeable 13 1920 7.84 less thaÞ. 1 ado 13 1920Q'Þ 10.01 . too friable 13 1928 8.U 1&88 than 1 mdo 14 1940 13.46 24 m4.. 15 1978 2077 impermeable 15 1985 11.'16 3,,8 md" 15 1992 8028 impermeable 16 3)00 5..2'1 impermeable 16 2007 4.98 1mpe1'18eable 17 2015 2.62 impermeable 18 2021 3..37 impermeable 20 2042 4..44 impermeable 20 2050 10..60 leell thaD. 1 m4" 21 2062 11.9? too triable 22 218) 5.15 impermeable 22 2129 3048 iapermeab1e 23 213'1 11.50 lese than 1 mdo 24 21:59 3.43 impermea.ble 24 2148 3.61 impermeable 25 .2l57 30013 les8 than 1 mdo. 2? 2241. 9..66 too triable 2? aasa 7090 impermeable 27 ¡as1 6,,89 impermeable ~Core ~tained by quebrachoð 4 J?etalled Ll tbologic De.cr1p'-t~o~ X.11T Bu8b1ng '0 ground 10 ~1. . SÐDClatoae. ver, fme grained. medium light g:r8¥fJ al1.ghtly argillaceous and 811Vo elichUJ ealcareou80 with BODle siltatoneo i1"8T18h 78110vD argillaceou80 ealcareouaÐ grating to ve1:T fine grained sandaton.e. Cl8l'atone. ..d1um ,;rlfl. slightly calcareou8n non-mlcaceou80 øllght1¥ 811.0 aDd sandsto_ as above() with veq small allQunt ot aUt.tone ln upper part. Cl,qaton. a. abov.. and 0181' abal80 medium da.rk gr&7o 11011- to-slightly ail Ìl'. . non-IIi caeeoua > Claq sbale a8 aboveø Wi th clqetoD.ec ana. a tmall amount of sandstone and clq lrol18toneÐ grqish 1'8110"0 non-calcareousD conchoidal :frae- tureø in lover half. . . .Q9Æ.t J)trq'h 28 2210' a9 ææ 29 2348 31. as11 31 35m 32 æaa 32 284i1. 33 2558 33 2568· 35 2889 35 2696 36 as 44 36 2646 36 2646 36 2648 86 aeso 36 æeo· 36 ·2654 36 2656 36 2666 36 S6S8 37 2662 37 2661 39 27aO ·42 3lO9 44 8æa 44 33"13 45 8eOt 46 3520 ltt'ect1'Y8 Poroalt.v 5..~ 6.23 5..37 9060 0.25 4073 4.96 2.13 1064 9q31 10..80 12.00 12.48 14000 12.40 8.67 10.96 9062 7.17 801'7 '7..20 12.60 12075 7.05 2040 3023 4.00 5..50 6..89 C.ŒBOBAD CONTiN! CazoboDate ConteD~ - S v We1é1i ~ ~th 44 3368' 44 3373 4õ 3509 46 3520 22o~ 28,,50 2'1040 16.12 0-18° 18-300 30-400 40-60 ø 60-70 0 '10-90° Eo ~ Per_aMl1 tv impermeable · · " .. · · · · .. · .05 Ko 16 114.. 11.5 a4.. 8 84.. tapera.able 1 ael. 1mpemeab1e too friable ilape1'lDeable _00 triable 1... _l2an 1 lid.. 208 ado 1J11peraeable 111peZ'11eable It .. .. It 9()'-~lOO U 100..1109 110-120' 120-130 a 130...14OQ 140-150° 150-160~ l5O-170~ 170-1809 180=2109 210-2309 230-2409 240=.2509 250-290 9 29Q...300 9 3QO-... 360 9 36Q...37ù n 370~380a 380-390 º 390-40{}9 4()(}.. 430 9 .430-4609 460-500 9 500=5309 530=5409 540=560 B 0 560=570° . . Siltstone ) medium light grS3e ølightl¡ calcareous, argillaceousl) Siltstone. with c:lqstone and clay shale a.S described aboveo Cl. shale with SEmdston80 very fine ø-ained. slightly calcareous to calcareous. and siltstone; trace cla¡ystona and cla¡r ironstone.. Siltstone with small amount clay shaleo C~ shale, medium dark (f;raye and clq shalee blaoko with coaly partings: 80ma s11 tstOAe ) &ad trace coal 0 S1,ltetoM. with ve-q small amount 01.., shalsø clq ironstone. and oand8ton8o Siltstone and cl~ ahaleo Sandstone. tine grained. ØBalt and pepperfto friable" non-calcareous ) yellowish t:rq Ð very 11igh tly argilla.ceous and eil t¡ \) wi th some llil t- ltone end trace of black shale. co&lj) and whi te and pin.1d sh wh1 1;e btm.toni teo S11taton80 Zlcn...calcareou.S., partly eandy" with trace sandstone and clq 1ronstoAeo Sandøtone al! above. slightly calcareous in. part. composed of white and. clear quarts" gray chart and brown and dark rock fragments" w1 th rare green gralnao Grains are angular to subangular~ often frosted. Some aU.chtll' calcareous clqstone i8 present in the lowest 10° 0 Saua. stone as above bu.t fin. to medium gra.ined; some 0181 atone in the bottom bello Sandøtol!$ø fine &rained. veT;¡ slightly caloareous, not; ail ty or argillaceous; very small amo)"mt of clay etone is slight11 calcareous to ver:¡ calcaraou8o C1Æq 8 tone., with S01.l8 sandstone as. above. Sandstonee light Utqø fine to medium grained ) uøslt and pepperl' ) non-ca.leareouso not siltyl) with large proportion of rock fr~nts" ~race Clqstou611 ¡nedium gra;yø calcaxsous" Sandstone as above with oome claystone" Clqstonee medium gre::¡D slight13 calcareousg ~"1 th some clay shale, medium dark ça:¡-o nC.D.=ca!oareous:> grading wi th depth to grea.ter amount cl8¥ ahale and less cla;vetoneo A small amount ell tstone is present 320-340° and a SI!ISll amount of sandstone at 310-320° e and 340-360' 0 Sandstoneo fin\) to very fine gr.a.1nedp oon....calcaraou0,) light gra;:¡ Ð sliihtly siltYe ;dth some c1.q shale and cla,fstonso Sands ton.e e verj fine grained. si1 ty" a.rg:Ulaceouso micaceous. C1q shale~ medi1.1J'!! dark grayo with. 'ilsry small amount ail tetone and clq s tone " 511 tstone, cls.vstone aJ;.\d clay shale m th veY:'! œlall amount eandstone" C1,2.7 &balee medium dark ¡¡;ray e non.-calcareouso Sandstone" TSry fine gra:i.l1sdo non-œlcareouße It sal t and peppar" 0 s11ghtlT 811 ty; fine gained in upper 10 a r. with tra.ce clay shale" Sandstou& very fineçrrlnad. VSl"'J" $11 ty and argillaceoulÐo slightl¥ calcareous in parte with small amo1.U1.t ola;y shale 460."7"4809 I't en4 490...þ()()8 e and trace cl~ iZ'onstone 480=49090 Clq shale. uwdium dark grq to dsu'k grs;¡,. with mall amount medium ßraT eiltstone and sandstone at 500-51010 Trace cl~ ironstone SQ0.=.510 0 0 Clq shale with some cJ..aystone¡> trace siltl3tona and àandatOEi.9o S11tatone with c1.a.v shalet .and some 8li~htly cëÙ.careouß to calcareous eandst0J18o Clq shale~ with 811·tstoneo 6 570-5809 580-590° 590-6000 600-610° 610-620° 620-6309 630-685 ø 685-'100' '100-740 0 140=790' 790=800 0 800-8100 810-830 ~. 830=8408 840-850' 850";8600 860-8709 870-8809 880-8900 890=900° 900-9208 92.0-940' 940·~950 Q 950-960° 960-970' 970-980° 980-9900 990-10009 lOOO-lOlOB 1010...10209 1020-1050° 1060...10609 1060-1070° 1070-10908 1090-112011 1120-1130° . . .')0 Clq shale with some ø11tstoneu verT small amount sandstone and cl~- ·stone. and trace. of clq ironstoneÐ 'bla.ck shale and coalo SandstODee siltstone and øhaleo Siltstone and sandstone II ve"r¥ argillaceous!! medium light g:tqo non- to 8lightl3 calcareouBo S11'tatone, with 8II&Ù.l amount sandstone and. clq abaleo Sandsione, non..calcareou8" wi th s11 tatone and. cla¥ abalso Clq Bhale" siltT. and siltstone, with trace eandstOn8o Cl8l' 8hals. medium dark gra: o siltT" with small aJIlount siltatoaeo .1iPUT cal careOU.So Clq ehale. mecU.WI ða1'k gr8¥o alightl,. 81ltJr. C1.a;y shaleo wi 'h 8011I8 black _hale and coal. C1.,. ahale, 11841_ dark ø:rq. non-calcareouBe non- to al1ghtl1' 811_; trace saadatone at 760=770° ~s composed of clear quartzo SmalJ. øount of black shøle and trace coal 11'1 lowr 206 0 . S1J.tl~neD medi_ light grqe TIer;¡ argillaceous" JlOJ1-calcareøu.llo with øall 8IIoUt clq ebale and sandstone" Sanð.øtone and siltstoneø -with veq small amount clq ahale., Clq ehale ) eil.. gradiDg to siltstone" w1 th ø11tetone and sandstone" vert tine gra1ned~ ail V and argillaceous ) micaceous ) w1 th rare car- boDaCeOU8 flake.o Gra1ns are largely clear quarts. with IOme whi t8 quart. and rare rock fragmø t8" 0181' sbaleD wi th very 81Iall amount black shale" Black clq shale" wi th 80me medium dark gre: ' c1.q shale and emall amount coalo Clq ahale ) with a small amount of white siltstone ) compO lied of. clearo . ole... aubAl1ßQlar q,uarts grain8 and having a sugar,y texture" Clq shale, V81:7 18811 amount of sandstone" "!(fery fine grainedo light grq" wi th vhi te 811 V IDa tr1xø non-caloa.reouse compo led of clear and v~ te quarts wi th ver;¡ rare rock fragmen is" One piece ot very 11ght grtq ch81"V limestone was present" 0187 shale" eil1i7 m1caceouBo wi UA eandstone 808 above" Sandstone. V81:7 fiae grained. 808 above. with some cla-Y shale" Clq Bhale. eil \To Argillaceous siltetoAeo gading to clq sbale., 8:t.lt¡r" Clq shale/) med1um dark gre: 'e with some black shale and a small aJDount of coal which increase slightly" in the lower part" Sands¡tone., verY' fine grained. V8X'7 argillaceous and silty I) grading to 811 tstQtle ) very sandy c and clat shale 0 CLq shale with black 8hale and coa1Ð and minor amount sandstone" 0181 shale ) wi th minor pount black shale and coaJ." trace saJ/1.dston~ ó Clay ehalell medium grq c ail V 0 and medium dark &ray I) I\OD- ell t7 0 Sandstoneo Te17 fiAe grained, medium light gz'lql) 911 ti:r and arg111aceouße non-oalcareou8o88r1c1 ticD With carbonaceous particles" Clqshal8e w1 th SOllIe black clq shale and trace co&1o Claf shale with trace siltstone Clq shale" aÜt¡r, with siltetone~ vert argillaceous" Cl8¥ shale" aUtT., with minor amount siltstone at topo Clay shale with aome siltstoneD . Clq shale wi th trace coal. Clal' ehaleo medium dark Ç870 and ve'q àrgillaceou.s 811 tatonaÐ medium grqo Cl., shale with siltstone between'1100=11100" Siltstone grading to cla.v shale" .., 1130-1150° 1150-11609 1160-1250° 1250-1260Q 1260-1290 ' 1290-1300' 1300-1330° 1330-1340° 1340-1350 Q 1350-13,70' l3"1()...l380u 1380-1390' 1390-1410° 141.0-143); l~l450° 1450.=14709 1470-1475° . . Sand stOlle 0 ve1:7 fine grainede 11ght fÇa'I'o ver3 argillaceous and silty!) non-calcareoas. with ~ siltstone at base.. S11 tstOlleo argillaceœ 80 grading to silt,. clq shale" Clq sñale. very lilt,- in 11pJer part ) with small amoWl' of silt.tone 11'10-1180' 0 and. 1230-1240G.. small amounts of black: clq shale at 1180-1190Q and 1200-12209 I) and small øounts of sands tone 0 ver' " fine grained. "Ie" ell.. argillaceous and 111caceou.8ø non-calcareous. medium light grq. at 1200-121.0° and 1220-123090 Siltstone and 01., 8haleo 0183 .balee slltT at 'base. wtth ømall aIDOunt siltstone 1260-1280'.. SJltstoneo .e4iWD 11ght c.tqo sandl'o argillaceouso micaceous, non- calcareouso w1 tb \IOJD8 clq shale.. C1q shale. 8il1;1 in lotller parto and wi tb ail tstone 111 bottom 10' 0 Sande tone. ver, t1ne graineds medium light grq. very 8il tT and argillaceous ) aicaeeouso non-calcareous.. Clq shaleI' wi th IIDall pout clq ironstone and "hi te, veri arcll- 1a080u8 bentonite. C1q shale\) w1 th 80818 811 tstone in bottom 10° 1) Olav shale with Some sandstoneo ver,v sericitic. Sandstone aa above" with Bome cl8¥ ø.bal.eo OJ..,. shal89 med1œ1 ðark graTo non-calcareous, nol1.- to ølightly sUty.. Clq shale aJtd siltstoneo with small amount sandstone. 01.,. .bale!) media grq and medium dark çs:'lø v1 th eœa11 amount ø11t- stone at top" Olq shale, with some sandstone. and minor amount .il tstoneo lfo sample.. ~ De"Q th 1475-14959 4,°711 1 Recove;rx aoq 0" Clay s:bal.se medium de.i'k gr93" s11ght17 ailtyo slightly m1caceou.s~ with rare streaks 81"gll- 1aceou8 siltstone ød clq ironstone.. Fair $haly cleavage indiCates that the bed.. are :flatlyi~" Clq stone. dark: gra;r, not 811 t'.I or micaceous, poor conchoidal fracture" Siltstonal medium g8¥ to mèdium light grtqo sandy in upper :part, 1\on=ca.lca.r~oufJo wi th marq laminae and intercalations of clq shale 0 InterlaminateCl. medium dark greq olea' shale and medium light g'!.'83 silt ehale; grades into Clájy'stoD.6. medium dark g¡:q" øilV"ø non- calcal'eouss poor conchoidal fracture.. Clqstonee medium !Ç8¥ & non-calCareous" hard ) with irregular intercalations BiltstODee somo of which have shallow vavy contacts resembling ripple mai.kio Grades into Sandstone!> very fine grainedll Tf$'q argillaceous and ail tYÐ no!'.!:=calcareO\lS9 w1 th a.bundant faint slightly carbonaceous and argillaceous laminae which are slightly crossbeddedo LimeatonGD very argillaceousg dense 0 BUtte medium g'l'81'. Zone Be (Va~euilino1du F fauna) mierofoß8il species rareD 6p8cirnellS abundan to 1 $Plö 333" Q9'7Ø 6'7" 310" 13]." oa 4d 8 Core -- B.m.\~ 1495-15099 2 3 1509-1525' 4 1525-1528' 5 1528-15459 . kctOv,~ 140 0" 168 O· 28 7" 17° 0" 382" 5'28 0'" 006Q 487' 1 °01' 480" 11°0" 2°6" 0°1" 19511 lDijll . Ola.1ston8~ medium dark çs,yo verr s11tyo non- calcareouso hard& wi th irregular cleavage!) Grades into Clq shale, medium dark grq 0 nOD-oalca,reouso vi th eha1T to subconcho1dal cleavage. Les. bard than clqatone aboveo Streak clq iron- stone at top. Clq øhale.. med1UJD dark grq. with abundant intercalations medium light grq 811tetoae, both DOn-calcareous. Beds e..ent1al1¥ f1at- 171nc. Interlaminated sandstoneo siltstone and .baleo wi th swirly beddingo Interlaminated medium l1ght grq siltstone and mediWB dark: grq clq shale, ·non-calcareOu8. .with sandstone laminae in lowr part; some 1s faintly' crossbedded and lenticular. Zone Be microfossil specie srareo speo:lillens common. Interlam1nated e11 tetone and clq shale ae above.. Clay shale 0 medium dark l#'8¥o non-calcareouso very sligbtl:r s11 i7; fair shaJ.7 cleavage in- dicates that beds are :f'latl71ng. Grades into Clay.toneD medium dark: grqo not sllt7e> sub- conchoidal fraci.ure. 1dth abundant pelec1'J)od shell s and a t1 sh skeleton lit long. Zone BC microfossil species rareo specimens abundan to Clq ehalep as in C01'8 3 abov8.. A few small etreake of sandstone present in basal lit of clq shalso Sanå.atone, fine grained, argillaceous. 11ght çq non-caJ.caraousfJ It sa]. t and papper"; sharp -õontact with overly'1ng sbale Me ripple-mark- like UDdulationso Zone :00 microfossil species rare, apecimeD.s commono Sandstone ) fine grained wi th a few medium ÇaiIUilfl medium light çtq¡¡ 8light17 silty and arg11- laceouso non-calcareous, with shaly cleavage (possibly due to variations in clay content of matrix) 0 Beds are flatly1ngo Sand 1s composed of subangular grains of clear and vbi t8 quar ts wi th some dark rock fragments and rare carbon-~ aceous particles. Sand.stone as above but wi th abundant lntercal·7 a.tiOD.8 and irregular laminae of medium dark grail c1a3 shale, Abundant coa,4r 1ntercalationfS 9 ~ P81:)t, 6 1545-15S5 t 1 1565-15839 . Becoven- 199 9" 18 a 0" 1aO" 1 Q 411 38011 195ft 09118 1USa 097" 3'31' 182" 29 4" l'1'SIt 0°911 lBO" . and .. tit coal bed are pre sen" in a 2" in terTal l' 'below top ot this interval. Grades into Sandetone a8 ait' top of core, with poor shalJ" cleavage. Clqaton&. medium dark gr:qo no~calca:r.ou.& ail V and micaceous in upper part.. , Sandstone as at top of corso wi tb poor to fair -halT cleavage. :Beds flatly1ngð _bracllo staiDing suggest. fair permeability 1D bottom l' .. Bo cut or residue were obtained 1D CC14 troD 1533t 0 De' )~ Effective Poro81~ ~ir FerDeabUt. 15331 10.. 6_ too friable SaDdetone as abo,,"e but more masSiv8. and ve1'7 fine grained in part" wi th common veq fine lam1uae of coaly . and argillaceous :material.. Sandstone a.s at top ot CON.. . Sanda tone 0 f'i Z16 grained. wi th some 'Wery tln.e grains. with intercalations. laminae aDd rare th1D. beds of argillaceou8¡¡ micaceou.s alLd coal,. material as in the 1 v 5" in t81'...&1 above.. The top 3" of' sands tone is JIled1 um dark gray because ot a concentration ot carbonaceous particleso Sand.stone a9 at top of coreo Sandstone as in 1uS8 1nterTal abo..o Å sample from 1543' showed no cut or residue in eC140 D~t~ ]lffective Poro81~ ~r Permeab1l1t.Y 1543' 12,,6. too friable Sandstone am at top of coreo y'erneuilinoid.es F fauna spec1JDens oommoDo species rare in e.hale. absent in sand.tone" Clayatonet grading to cl8l' sbale with poor 8haly cleavage; medium dark gray e !lon-calcareous ) slightly micaceous añd 811t7 in upper parto Sancbtoneø very fine aud. fine grainedø medium light gr8¥t non~calcareous. tail' shal7 cleavagso a8 a.t top of core 50 Qjlebracho staining 8ug- gests fair permeability at 1548-15529 and '1559-1560~ ~ No cut orrelil1due of oil were found in CCl4, at 155.3'; So 79l1owieh greaq stain was present a.s a residue at 1563~ Ð but no cut was notioea.ble a.t that depth.. De~th Effective Poro81~ Air Permeab111tl 1553 ~ 18" B8% 305 IICÎ. 1553e 11,,05 , impermeable Vsméuilinolìias F fauna çecime%ls commono specie.s rare in shaleo absent in qndatonso Sandstone as in Coreô aDov8o Clqsiouo medium dark grqø nOD.-calcaraous~ ver¡¡ slightly ø11tyQ with P7ritlzed wood fra~ mento 10 Cl,q shale. e11 t7. with sandston.e" fine grainede ve-q slightly to non- ser1cltico aligbtl7 silty" as in cores abov8o . Cla;?' ahal80 dark gr87 \) ail ty" 1#0 medium dark grq 0 verT slight17 s11 ty 0 Trace sandstone" ve17 fine gainsdo sugaq texture. verT e11ghtlT argillaceous, not micaceous" at 1610~1620u C> Cl87 shaleo wi th some sandstoneø fine to very fins grained. medium l1ght grq. Tier:! slightly eiltjl', non=-calcareouso grains composad of .. clear with some White ~tzo Sandstone a8 in saJD-ple abov8o . ~ ~8"Pth· RecoveJT 593;& 9~8" 194ft 1583-15909 1590-16349 1635-16400 1640-1645° . Sandstone as in Core 6 2.bOTeo fine and V8Iil fine grained', wi th poor sha.ly c1f1&'Vage in upper parto good 1n lower part. vi th thin etreaks and intercalations of med.ium dark gr87 c1q ehaleo No cut, but a 7ellow1sh greaay stain" wre recovered in 0014 at 1570° 0 ~t~ Ef(ective Por081~ Air Permeabl1i~ 15709 16o~· too triable Interbedded and lnterl8ID1Datecl medium dark gra:¡ clay- shale and 11gbt era:¡ fine gra1ned. sand.stoneo and mediUIII grq siltstone. in appro~ ima telT equal proportiOD.8o Laminae v&rT from ve'q even to Te17 irregalar 8J'1d 1en t10ular 0 Beds essentiallJr na~lTingo Sandstone as at top of coreo Varneuilinoides F fauna specimens common 0 species rareo C'Qre .Depth Be coven a 1645-1665U 200 . oft 096" Clqstone, medium dark grrqo non-calca.reouso wi th sil ti1' laminae" 12~8" Sandstone aß at baae of Core 6 &b0'780 . ~bracbo staining suggests :fair peraeab:Ui V through most of this section except the lower 1 s ow:1ch ehows no staino A vert faint cut and faint greasy stain 'l!iere obtained in 0014 at 164900 pe" )~h Effec U va Pore si~ ,!il' Pe~eabi~i tl 16493 ~~ i3oOô~ ~ too tr1ab~e 1654' 13089 805 mdo 6°10" Cl8¥stone, medium dark grqø slightly to nOI1= 8111;7 except for uppal' 1/3 which bas scattered intercala.tions of Silts,tone showing 8w1r~ bedding" Frac ture irreg'.1lar 0 Vernaw,11noi4!...f.lF fauna specimens abundanto species common in ehaleø absent in sandstone. 9 1665=16709 0' 6" Cla,yilltone as a.t base of Core 80 .VerneuiliJl-ºidea F fauna. specimens abundanto speoies commono n 1570=1710i¡ 1710=1115G 1715-17169 Qqt! e . Clq 8haltto medium à.a.rk gay!! very slightly in ty. Clay shale., VIi th S01l1& sandetoneo fine grained, medium light greq" s1l tJro non-calcareous" "Wi th clear aud wi te quartz with \iOI18 rock fI'agmentBo Sandstone. as above. ~t4 ~4!.cove~ 173 6" 11826 Sandøtone fine to V8~ fine grainedo med1wa light grqp very silty and. arg111aceou80 non- to slightly calcareous" 1II&8siTe. Sañd is composed of subangular grains of clear and wh1 ta quart£o wi th some dark rock trag- men.ts and rare carbonaceous partlcles~ Sll&ht variations in carbonaceous particles and ar- gillaceous material causes faint V9%7 fine lam1Da6 through most of the section., Between 17289 and. 1 ?29J is a. section of medium Crq slightly carbonaceous ail tstons9 wi th a 1 d bed of verr carbonaceous black e11 tstOJ1e 611 from the top. A Tery faint cut and verr pale yellow residue wre obta.ined in CCl4, from 17199 " .Be:pt~ .!U.ective Poro!UZ 411' Permeabilit:y 17l91J . . 6" 7~ 1$88 than 1 md" 6G4" Claystoneaø in Coree 8 and 9 aboTe~ Silt- atone 1enticles present 1n upper 3g~ l1e~.!tu1l1nold.!s F fauna specimens COllUl1011ø species :rare" 10 1716...11368 1136=-1190 n 1790=1000 a l800~1810a 1810~18201J 1820~la301J 1830=1870~ 1810-18758 -º"2t:! 11 C1q shale 0 medium dark g'rl':ii¥o very slightly silty; silty streaks in shale in bo t tom 10 it " Siltstoneo sandyø medium grayÐ non=calca.raou's) with minor amount cle.y shale and trace white benton1tso slightlT argillacaoua. Clay shale and siltstone with'~inor amount ~datoneo Siltetone9 aand1ø and sandstones silt Yo with some clay shale" Clq shaleø with some sandy siltstone and tre.ce silty sandstone" Clay shale. medium dark gl'9¥n very slightly silty- to 811 ty. with minor amount sandstone and a11tstona at 1660=1870"0 Sandstone a$ in Core 11 below. wi th some clBJi" shale? .peJ1 t.1! ~COV8~ 18?5~1895!1 a)6 0" 264" Sand9tone as at top of Core 100 but V8r,7 fine grained in top 8 I; 0 below which is a 3" in ter= val of medium dark gra:.f clay stone" 2\iS" Interbedded medium dark gTa3 clqstone and medium g:¡:~ faintl1" lamina.ted. s:i.ltstone~ Beds are 2=811 thick ) with equal proportions of s11tston~ and cl~atoneo 1~On Cl8¥8tonaa~ in Core 10 above 0 but with e~~= ~oncho1da.l fra.cturs in basal 2° 0 l!l 211 Olay shaJ.sr. meètium dark gJ.'ay. similar to 0183= stana ~bove but ~ith fair shaly cleavaga~ Bads e~ß!.liìntial~- fl~.tlyingo ,~ ~,.d::I . Core DS'Ðth ~ecovea 12 1895=19158 19°6* 13 191~1935G 18° O· 14 1935=1955 G 19 a O.f . 6310. Sandstone 80S in Core 10; V817 faint cut and pale yellow residue in CC14 at 188990 DeÐtJ:! IIff.cUve Poro~~~ Air Fe~111 tx 1894' 14..2~ 18 mde Microfossils ver.y rare.. Sandstone 80S at baae ot Core 110 bu." with poor øhÌ1l7 cleavage and rare intercalations 01' clq shale in lower parto Q1ebracho ataininc eug- geats fair perJDeabl1i tJ' in top 1 e and. from 1B991J to 19013.. lio CI1t was obtaine4 C014_ but a. greasy stain waG obtained :from 189S'. a faint greasy stain trom 1904'. and no sta1D from 1914u 0 A verT faint odor was noticed at 1898' and 19049.. DE!:gth Effective Porosi ty .ur P81'll8&bl11 V 16986 12..1~ 1105 mi. 19040 13061 32 1914° 12010 25 Microfossils very rarso SandstoD.eø fine gra1nedo medium light grq" silty and argillaceou80 sllgbt17 calcareous from 192'1" to 193031/ and non-calcareous els8- where; ma.øs1ve" with rsze faint s118htly darkero s11¡htly more argillaceous laminae that some= times fd»w crotø-beddingo In the upper halt of the coreD someaeotions that are 2-611 thick and 1-30 apart show quebracho stainingp uh1ch sue- gests bettaI' permeabili;Y for these 8eottons than for most of' the sandstone" Beds are appro::r::lmately ílatl;r1ngo i'he sands.tone is COJil... posed of 8ubangular& often frosted grains of claar qUartz ~~th some ~ite quart. and rare dark :rock fraÐ1lentao A few grains have un- weathered overgrowths of. clear quarts., g1 v1ng them a aubhedral shape" 1J~pt.4 Effective Porositjy Air PermeabilitY. 1917° 7,,36" impermeable 19200 7,,84 laBs than 1 md" 1920,,* 10001 too friable 1928 8033 leBs t:ban 1 m" ·Core stained b.1 quebrachoo Microfossils are a.b@ent" 4GO" Sandstone as in Core 13 above,) with irreiular scattered intercalations of clay ironstoneo carbonaceous and argillaceous material between 1937Q and 19383.. 3u 31 Sandœtone as aDOV!$ but slightly COaI'8er and wi th to at top containing abundant BIDall, streaks of cl., ironstone and carbonaceous materialo .Basal 1" of sandstoJle is very fine grainet\o ~Rth Effective Poros1~ Air Permeab~li~l 1940~ 13" 45~ 24 m~ J.3 . . 9.o~ª DEm~ ~co'V'e17 1199ft Claystone, medium dal'k grëf3t> non-calcareousD slightly eilt70 irr~ar fractureD !1!hin (und.er lit) beds of .medium gr;q siltstone in uppa:t' 6 Ii 0 fine s11 tS.toll@ l&t-ainae in upper ltØ ø Verneu.ilin~id6!! F fauna specimens abu.ndanto species commono in. c1ay s tone" ab8e1lt in sandstonao 1955=19'10' 197()...1975' Clq &hale. not sil tT to rarely sl1ghtl,y 811 V 0 Sand.stone. fine gra1nedo argillaceous and siltyo flealt and peppel'''o non- calcar90u.8o .9.9-¡:~ p'~t1} P.ec9,YeQ 15 1977-1997\'1 193 611 SandstODae fins grained. medium light gr&fo s11 ty and a:rg111a.csousø non.-calcareou8c mas3ive¡¡ except for a 6il I!&ction at 1988° that contains common c:a.rbonaeeol'l.s pa.rtingso Q.1ebracb) stain~ ing in the upper 6vfI"~-esta slightly better perm.eabil1 t1' in that part of t he corea $and- stone becomes slightj,y fine~o ve:q argillaceou3 and sil ty wi th deptho The aa;nd. 1 s similar to that in Core 13 a.ñov&~ but bas fawer subhsdnù grains and more wh1 lie quarts" l4.icrofofilslls absent 0 Dsoth Effeotivø Porositz 197à- - - 2" 7~ 1985 11,,76 1992 8,,28 Air re11J1eab1li ~ iJUpermeable 3,,8 mdo impermeable 16 1997~ro143 1';6 0" Sand$tone ve'q fine absento DJ}J:!. ~1; aoOO¡ 200'1 D a.S in Core 15, grading to fine to grained with deptho Microfossils Mfsctive Po:ro~.:~ Air permaabllitz 5027% impermeable 4,,98 fi 17 2014-2017U 30 0" Sand8tOI'ì.00 :fins to very fins grained!) medium light grayl) massivee nOJl=calcareou8 ) Microfc3silß ab$a~to D~~th ~f9ctlve Po~_tity Air Permeäbil1t¿ 2015 9 20 5~ impermeable 18 2017,o2033° 16 DOli 12üort Sandstone~ ver,v fine grainødo ~er.v sil~ ~d argillaceous!) madium light gre;:¡ ~ non....calcaraou90 ma.$Bivao Ât 2021 u 1s a. la;rsi' of' :rounded 'to wall rounded pabbleso t~ to l~ü in diametar~ comPQssd of bla.Gk aud g¡:a;g chert" light ~q bard lI.On= calcareous aandstOD.e0 and on~ pebble of red and dark grsen char to A 411 'bed of iD0d1um gay very- silty claystone is preeent 2° a.bove the base of tb5 sandstone" J.4 . .~;r.~ ~:P. tJ1, Becoven: 19 2033-3>3'° 4' O· ao 20 3'-a>5 '1 , 20' 0" 21 2057-2076~ 15' 0" 3076=3095 t a)95-2113G . ~..D.th .~:tf8Ctiv. poroa1v Air Permsabtl:1.~ 2021 ' 3037¢ impermeable 4'0" Interbeddød medium ff,rø:¡ s11,stone, and _d1_ dark g:ay cla.;rstoneo non-calcareou8o Bed.a are l...alt thick, with approXimately equal proportions of siltstone and cl"8toneo Microfo8sils absento Oa10. SandatODee ve'Z7 fib &rained. ve17 811*7' aDd argillaceous/) lIed1wa light¡ grqD J1OI1-calcaJ'eoU8e JI&.etTeo 0'6- Cla¡ystone, mec11\J11 4ark gr8l/ø 81i&1:&$11' to verT lilVII with laminae and. intercalation8 01 medium dark grav 8iltstone. 1'6" Sandstonat fine qaiø.ed. 11&h1; I#q" el1ghtly .i1 V and arctllaceou8tt non-calcar.oae. wi 1;h ill bed of rouaded clqstone pebbl.. in medium grained. sandstone matnZo 8" below tepa 1'2- SandetoJ18o tine gra1ne40 light gra'¥; 811117 ana. argillaceous, but ver,y tue gra1ned. and wi fih thin beds ot medium grrq "'.r¡' argillaceous ailt- stone, in the upper 6" 0 Microfossils absente Sandstol180 veq fine to f1ne grained, slight11 argillaceous and 81lt7. med1um li¡ht grqo non~ calcareou8o with qu.e'bracho 81ia.1Ding 8ue&estinS fair permeab111 ty, and. øha.l7 cleav8&8Ð troll 20399 to 3)47' e Beds f'lat1¥ing.. Above and below that interval the lud.tone is more ma.sivth having oDl,y occasional bedd.ing-.plane breaks.. Sand i 8 composed of suban.&Ular grains of clear quartz wi th some vb! te quart. and dark rock fragment.. MicrofoBe1ls va7: " :rare.. D'12~h Mfect;. ve ioroai tl: J.r Pe_e~1li Q 2042° . 40 ~ impermeable 2050fi 1006 less than 1 mdo Sandstone as in .Core 3.>. non- to slight17 calcareou.s0 td th shalT cleavage fro. 2060 9 to 2063' 0 Beds flatly1ng.. Below 3063 t ø the 8&Dà.... stone 18 more massive but has common carbona- ceous and. argillaceous lamina$o some of which show~ight crossbeddingo .i. 1" bed of JI18d.1um dark çq 811 ty carbonaceous clqatone 1. present at above base of corea Microfossil. ver:¡ rare.. ~th .!ffective Porosity Ai}" Permeabl;L1g; 2062 ~ 11 0 9~· too friable Clq øb&le. med1W!1 dark grqf¡ slightly to non-sUtT. with verT small aDlount aandB tons 0 verr tine gra1ned~ in top half'o Sandstone and clq shale? 15 . . . .... .9.9n DeU,.~ Becov~ 22 2l1a...213Z1 .209 0" 103" Sandstone a.S above, 1d th COIGO:!. to abwu!ant coal,y streaks and part1Dg8o 181! 9" Sands'toD.01' very tiM to fine 8Z'aine4. ft"q 811 ty and. argillaoeoa8D me41um l1pt ersT D 1l1chUy calcareou8 1D. parto ...at.ve. liaee eTea carbonaceous lam1nae bet....ea all." ad. 2118' s1low ecme CZ"oes'bed41J1Co Microfossil. abient. RtPth .-recUv. '!l~.t1¡r Ãi1" ~ab~lib' 2lao' 50 ~ 1JDpe~1. 21299 3048 . 23 2133-3138 d 5' 0" Sandstone ae in Core 22 a.boveo absent.. .Depth 21379 Microfo8.Ua ~fect1ve.:Po~8it, &11" Permeab111V 1105~ leas tbIm..l mdo 24 2138...2156 0 180 0" Ssnd.otQ:ClÆh very fiDe grained, ft'Z7 811't7 and arg111aeeo\1So medium light gr87", Don-calcareous, maas1V90 un.lf'ormo !he sanda tone ia composed ot anga,lar to aubangular graine of clear and vhi ~ quartsD wi iïh some gq and· dark rock fraga.at.o Grain ewface8 are of'~n f'ro8wd~ Carbonaceous particles and &u'bhedral qU81"ts çaiAs are ve;q rarao Microfossils abaento Rep-th Effeotive :poroe~~ 213953,,~ 2148' 3061 M-r PermeabilitY" impermeable " 26 2156-2158 u 2u 0" Sandstona as a.bsento DeJ'-!~ 21S? ú in Core 24 above; microfossils ;Ut,--c..i~ve Poro81~ Air _Permeabll:1..-V 31)05~ less than 1 mdo 2158=2168" Sandstone. fine gra1nede argillaceous and sil tuo nOX1=calcareouso with minor amount clq ehalso Sandstone" veq :fine grainedo argil1a.eeou.9~ .noD.-calcareouso with 0187 I5hale~ and small amount 911 ts tolleo very S&D,ð¥ 0 very slightly' calcareous. 216~2182ß Core!] ])Ø'J)th 218a-2197i ~ 150 ott lGO" Sand.stone as in Core 25 above. with :tain.t argi11aceou.ss ea.:rbODa.C80Ua lamin.ae in lower 4" 0 14~O" Intorbedded vel7 f'1n8 grained mecl1:wn light greJ sandstone and medium dark gra:¡ claY shaleø with the former grading to eand1 sl1 tetOA8 with deptho ~e &andßtone-siltstol1e beda are 2-1Sn thicko &Ud make up app:ro:dmately 2/3 of 'the rock~ They" are non-calcarsou8o and otten COD.- tain. laminae and partings of argillaceous or carbonaceous ma.te1":i.alo !he claystone beds are i-õ" thick" Beds a1pp¡-oximate17 flat-lyingo Microfossils rareo 26 16 . . 219'1-2a>õ9 2205=a235D 223&~324.0 0 Clq shale and veZ1 san.~ 811 tstone.. Clay ehalea medium dark grq~ Vf!fq al1é:htly silty at top.. Sandøtonðo 1'ine gr'a1nedo 11gb. t grq. 8il tT and. argillaceouso non.... calcareouse v1th minor amount medium dark grq clq shal80 -Q.~~ ~'Dth ~ve17 ?J1 2241....2261 D 209 Ot! 69 Bit Sandsto21th fine grained!! very s11ghtlT areil... lac80ulo medium 1i,ht grqo non-aaloa:reoUBo wi th shaJ.7 cleavace: qu.ebracho 8ta1n111& suggests fair permeability. Bare b-apen1is of carbonaceou.s plant remains in upper part.. Beds flat1Tmg.. :Dç~~ Yfective Poro.i~ ~r Pe%'lll.s.Ab:1l1tZ 2241. 9 9 ø 61S~·. too .friable 1394" Sandstone. fine grained() grading to tine to V$ry fine grained with 4e:9t110 lIed1'W1& light grqF/ ail ty and argillacaoU1Je non-caleareous ) massive 0 un1forfAo Faint laminaeo clue to vert sli&ht variations in quan.1ii V of' carbODaOeouB particleso are present between aæao and 33540" Microfossile absent. 1>cmth Effective :f01'Ositl ~r Permeabil19; 22529 .. 7.. 9f11, 1m.permeable 22613 6069 " a8 2æl~.2283' 213 Oft liacove17 from this core oo:rus1sts of fragments!} 1...411 in diams ter (except for one 13 long) e whioh were Bent to the Fairbank. Laboratoq in two core bo:uso one labelled 2261-22?1' (\ and the other 2æ8=2275 , 0 The fra&mente are all sandstonee fine to very tine grained.. 811 V and. a.rg111a.csOUB" non-calcareou80 me41um grrq to medium light gZ'S3e uni:.formo apparent17 IDaBsiveo Sand i8 compoaed of angular grains of olear and whi te quartz ¡ w1 th rare brow and dark rock fragments, and rare mics.o pept~ J!.ffec~ve Pox-oait&! Air Permea.bili~ 2270t 5ð55~ impermeable 2283-3386 g 3286-2300° 2100=23309 lito sample Clq shale. medium dark gra:y, "iTer:! silty. Sandstonee fine grained, medium g;ï:s;ro !tsal t and. pepper'· & with some ver:! fine ß1"alned sandstones very silty and argillaceous and grading 'to siltstone in upper part; some clq shale also present" ~Ç,o~e D.-øth 2330-23493 ~cove~ 189 0" 102" Sand. tone 0 fine grainedo medium light graJo D.on-ealcareou$~ coarser in upper a" ~ a. 211 bed of medium dark grcq cl8¥ shale i~ present 71t below topo 3°2" Sandstone\> vary fine ga1ned~ mediwng't8tf. nOl1= calca.:reoueg with a.bundant intercala.tionB and pa.rti~g· of carbonaceous and. micaceou.í?:I ma. teria1.o A ¡" bed of claystona i~ þr~s~nt at the b~se~ 1'1 29 . . Q9Le .Dep~ Recovea: 03811 Sand.tone, grading from med.ium grained at top to fine grained. at baseo o Q 7" ClqatOJ1lge medium dark grq.. 811"0 110:11- calcareous.. 1 e aft Sand.toM. tine çaiudll 811 t7 an4 arg111aceou8Ð medium 11ght grq. non-calcareous. With argil- laceous l&JD1nae in lowr 1 ß /) O'SIl 01..,..ton. a.s above. with i" bed 0'1 eandatone near base.. 103'11 SaBelstone. 1'iDe and ve:r.r :tine grain.. _diua 11pt grq" B11ght~ to veq ø11V aac1 argU- laceoue. nOA-ca1oareoua, _..ivel) 811Ft variations in carbonaceous content Ca.1188 v:er, faint løinae in upper part of the øaDd.8t0J180 Beds appro:dmateq flatll'1ngo A a" bedot medium dark en:¡ claYstone is present at .2340° 0 Slickens1d.ée and white calcite veinlet. are pl-esent 18 above the base of the core; the bot~m lŒ o~ core is elightlT to var" calcareouso De' )~ !.ffec~1ve Porosity Air Permeability 2338f . 50237' impermeable 234BB 5..37 .. Microfossils absent.. 30 2349...23680 110 0" oDe!t Fr~ents of øand.tone. fine to very :tiDe grainedD medium light gr8¥. non-calcareous, with some ølick:eJua1d8d or calc! te-coated surfaces" 10' 4ft Sandstone as above!) grading to very tine crainedo vary 811 ty at ba.se. _SSiTel'! with breaks dippinC 20-300.. Scattered fragments end streaks of clq shale are pre.ent 7(1 (I 488 a6 and ln above base of core.. Laminae of al.,. .hale dipp1Dg 450 are preøent 3° aboye the bale of the core.. Slickensides are also present 48 above the 'ba.Be of the COl"&o Microfossils absento 2385-24806 01., shale with small amount s11tston&o Sil tetoœ, verT micac8ouso med1um gray. wi tn minor amounts clq shale and sandstone.. Clq shale. medium dark grq. nOI1= to very slltT@ with _all amount 811 tstone at 2385-2405' I> and traces of 811 t8tone at 24l5-2400° and 2440-24609; trace. aandetoD8 at 24l5-2425ij and 2450...24609.. S11htone, medium grq, ve1.7 micaceous. v.l th emall aJllount clq shale.. 01., shale ßZ'ad1ng to siltstoneo Sandstone. fine çaine4. non-calca.reouso argillaceous and. sUtT.. 2368-23753 2315-23856 2480....2490° 2490-2500 n 2500....2510a Core Deu!h 2510-æ30~ Becovery 31 190 0" SandB'tone, fine to V817 :fine gra1:l.ød.c medium light grq. non-calcareoU811 mall si'IS 0 un1to:rmo bu.t becomi:1g slightly finer grained vi th deptho Fe.int cazbonacso1.\S! laminas Qre nresent be;tf9~ 35149 lW.I.Ì 3515~ ~ oeds are e.pproi1ma.~el'y :fl&iF~ 18 . qo.t! ~th ~cove~ 32 2530-25470 1'1' Oø 33 2547-266'1' 20' 0" 5'10· 292" 10'0" 34 2567-25'138 6' O· 280. 0°90 303ft 2573---2590 Q . l,.ingo Slickensides are present 1n the sand- .tone at 25219. Microfossils absent. De'Ðth l1'fectlve Perosi ,yo Air Permeabili t7 25118 9os:J1, ilDpèZ'll8able 25218 0025 It Send_tone aa above, but elightl7 ctazker and f1ner grained wi th depth. gadiDg to .e41U11 gr&1' 0 ver,y fine grained and 811. at base.. 1)81)~ iff.cUTe Porosity ~r Pe1'Iteabilib' 2532' 40 '31- impermeable 25419 40 96 .. Microfossils absento Sandstone a8 a; beee' of Core 32. ~1'! Effective Poro~v Air Peraeab11itJ' 2552' 201~ impeZlleable ClqltoneÐ medium dark grq. with 8càtter.ed thin beds and lamiDU of medium grq siltstone aDd very fine grained medium light &r8'¥ 8aI1d- stOD.ee which increale in thickness wi $b depth. Sandstone a8 in Core 31.. D8'Ðt11 Effect1vePoros1tz 4irPersaabilitF 25629. 106'- . impermeable Microfo881le abeento Sands tone ae at base of Corer 330 Claystoneo (cl~ ironstone"). lite diu brownish ';87 e not 811 ty" conc.bo14al fractur9!) very slightlT calcareous" Sands toil" ø fine grainedo g-.cad1ng to "'(err tine grained and from light grq to medium light grq with depth" Å lØ l81'er of med.1um 4ark gr8¥ cla¡ystone pebble B i 8 pre BeD. t at top of sectiono and var" fine argillaCeous lem1Da8 are present in upper part of sandstone.. Carbonaceous streaks are present throughout" Beds ere approximately flatlying" Microfossils absent" Sandstone. veXl' tine g:rainede very ail ty 0 a8 in core above; minor amount clq 8hal8 in lower parto -º.9.!:! ~~ª JieCOV.17 35 2585-26050 rou 0" 11 a 6" SandstoD80 very fine grained~ 811 V aud arg11- laceouso medium light grqo ver¡¡ slightl1' mioaceous, Tar:¡ slightly calcareous, ID&Bsiveo A lqer of rounded gr8¥ chert pebbles, 1/81f-i" in diameter is present at 2588'; rare patchefð of flat pebbles of medium dark gray cla,y shale are in the lowr half of the sandstone" ~he 19 .C.ore 260(5...2615 u 2615-2625 u 2625-2635 9 2635-26419 .P~~ . Becove!7: 096" 095fl 03311 362- 3911" . well geologiat noted that the core bled 011 from 25839 to 2589~ 0 25930 to 2594Ì99 and from 2595t-' to 25961-'" Å light yellow cut and ;yellow reø1due 1IIere noted. in eCl", at 25896 and 25966. There is no perceptible difference in the sandstone be~veen the lnte1'Tals which bled 011 and thoae which did not" De'Dth Effecti ve Por2.!Ul: ~ Per..ab11i1!7. 25896 9~31~ . "' 1mpermeable 25966 10,,60 · Clqstoneø .med1\1JD dark grqo 81ightlT ail Vo with le.l1Se8 of medium grtq siltston... Sandstone as a.bove.. Clqstone a8 above" SaDdstone as above; bled 011 from basal 3" It Clqstoneø medium dark gr830 a11t;y to :o.on-ø11 Vo irregular to poor aha¡y cleavageo Microfo8811a absent" Clay shale ~th trace siltstone and ~ite bentoniteo S11 teton.o medium gI:q ¡¡ s11ght17 m1caceou93 ver:r slightly calcareous ) wi th minor amount clq shale Cla,y sbale gra.ding to slltstoneo with minor amount sandstone.. Sandstone as in core belovo with trace siltstone and ol.v abalso Q9~~! ~~th 2641=2661 & 36 RecO"!-'!7 209 0· ouad OU7" 18'7ft Sandstone as in. Core 35 above" Clqstone as at base of Core 35 above II with a.bundant laminae of coaly material in bottom 2ft" Zone Be (Vemeuilin01dea F fauna) m10ro- .,,~ -~ - f08811 species co~on. speci.ens abundant" Sandstone 0 fine grainedo silt7aDd arg111aceouBn medium light gra::h very sligbt~ to non- calcareousp massive" 1 t is composed of angular grains of clear and white quartzo and dark rock f'r~e:o.ts" Most gra1n3 are frosted.. .A.bundant intercalat10ns of carbonized plant tragœents are present at 2645~, and carbonaceous laminae a. t 2653'" Carbonaceous and argillaceous laminae are common between. 2658B and 26609 ~ they dip 0-5°0 Patches of sanq clrq ironstone are rarê throuø;oout. Sandstone at 26466 he.d a TG:rt pale yellow cut and light yellow residue 1:0. CC14Ð at 2656B it had a light yellow cut and yellow reaiduÐ0 ~~J:!th ]:1feçllY-litforosi t,l: 25449 12,,00% 2646 Q 12" 48 2646D 14000 26489 12.40 2650Q 8..6? 20 Air Pexmea.b11it~ - 405 mir" 16~O lido 11,,5 md, BoO md.o impermeable . 37 2661-æ81~ 14' 0" 4:'0' 1°3" 06101f a02" OØilf 19a1S . Be"Pt~ 265011 2654~ 2656 u 36569 2658 0 ~r Permeabl111iY le8s tbaA 1 I1do 111p81"Jleable wo friable ll1p8raeable too fr1a'ble ~ffect1ve porosity 100 9~ 9a62 7017 8017 7020 Sandøtone as at baae of Cor. 360 'but with scattered coaly laminae which beCOll8 common to abuclanto and grade from flat to f1Þ17 undu.... lati~ wi th c1eptho T1:Ie7 clip 30° a't the tOPe but the dip cleerea.'-. v1th d.epth to 00 at t1'l8 'base ot the sandstoneo 4 f.v clq Iroa.t.oae nodule. are present in lølnae 111 the 10wr 1'... SaDd- .tou at 26626 had a 7ellow cut and. òro,.ish 7ellow residue 11\ 0014; the wll geolo£18t reported that th" cor. bled 011 from 2661' to 2664' 0 ~th Jffect1ve Poroa1~ &1" Perme,b1l11;y 2662' 120 5aJ, 18s8 than 1 lido 26630 13075 a~8 ~ . Sandstone. Ye1"y fine grained.. with V8r'1 tineo ayeno dark laminae which are the re aul t of yarlat10ns in quanU V of carbonaceous and a:rg1l1aceous mattero b lamlnaedip 300 at tbe top of the .8ct1011o but curve gracJ.ual17 80 tbat a.t the bameo where thç termuate abruptly against the under171ng 811 t8ton80 the,y are near17 Tert1cal (as...900) at one side of the coreu and a'bout 700 at the appoal te dde.. At the top of the sandstone i8 a section of cl81- ston80 ill thick on one SideD and wdging out on tbe othere which fille the interval between the tla tqing laminated eaudstone above anct the 30° dip of the eandstone belowo Silt8toneo medium grrqo Yer}/ argillaceous!) non- calcareou.so Streak: of sandstone at top shows sw1rl1 beddingo Slickensidea are pre88JLt near top and bo t tom of the sec tiOD.: they are usually steeply dippingo fhe top of the Mction i8 sharp ) and cUps approximatelY 500 D 1n the opposite direction from the .iee~ dipping laminae of the over~ing øand.atoneo Sandstone Ð fine to "f!eq :fine grained.. very s11 t7 and. argillaceous, with streaks of carbonaceous part1cles in lower part d.ippiq 30-60°0 fhe sandstone 1 B calcareous in tbe lowr 1°;, Clqstonet> medium dark grifTo 1l1ght~ 811t70 wi 1;11 slickenside8 parallel the bedd.iDC.. !fop and bot tom con tac is are sharp but lrregalar.. S&Ddeton8e f1ne to yer,y fine grained, argillaceous and sllV!) "salt and peppertl ) medium light ø;ce:¡o 21 . . 9.ore D4t )th. Recovery al1gbtly calcareouso with streaks ot very fiD.e sandstone in upper parto 1"9" Sandatone as abovfh but wi th coarse carboDaCeous particle. imparting an appearance of ht.rly beddingo Streaks (l...au wide) ot 8il1;atonso and & 1-3:3" traament ot clq shale are pre..t 111 the central part of the eanå..WD.eo vh10h p-ades \0 argiUaceou8 siltstone and all. üale in the botto. allo oøall Sbarpl7 interlaød.ute4 með.iWl ,ay .ilt.tone and _418 dark grq cl8l' sbaleo Dip.,oo log" Cl._tone. me41um 4ar1t grq D aU Vo wi tit etrealtt of arcillaceøus siltstoneo Steep3¥ dipp1ac slickensides present in clqatoneo COAtact wi th wu1er17ing 88Ddetone 11 ebarp. ...4. 1'''' aembles .. ripplemarko 0'1011 Sandstone. tine to Y8r7 tine cra1ne4, .edium light grl/J7" alight17 calcareous, with patohes and small streaks of carbonaceous ...1;er1al 8114 clq ahaleo ... tB interval ot a'buDd.,.t clq intercalations aU below the top ot the sand.- stone also containe a'buaclan t Inocerø_ ahell fre.&1Dentse and one white quazts pebble." in üaaetero Microfossils ve"r7 rare.. 38 2681-2701 ~ 16: 611 OQ 411 Sa.ndstone, very fine gra1neå.o argillaoeouB and silty. medium l1ght grq. with V81'7 taint argillaceous" ail tf laminae" Bed. flaU71nco 1'811 Cl¡q ahal80 medium dark t;ra7o non-calcareous" wi th small lenses (1-2" thick) and. 1....1Da8 of med1um ga:f slltstone. wi ~ sbarp contact. resembling ripple marks.. Beds flatlT1ACo 1geft S11 tetonae medium gr8'¥e V8r¡r ar¡111aceous" ca1= careOU8. f&11'1'1.7 laminated" ancl with rare ye"r¥ thin (l/a" thick) beds of clq øhale near the base" 4°311 Clq shale as above" 0°7" Su.dstone a8 above" grading to med1um 1;87 sanÒ¥ siltstone at baseo 3'011 C1qetonep medium dark: grq. 1rregular fraetureo, non-calcareous.. 386" Clq shale all above. but wi th s11ghtlT thicker sllt.tone lense8e 1'18 Sandstone a.s above" but very 81lt7 1n upper 2~o Dip of løinae 3°0 '01211 Clq shale as above" Microfossils rare" 2101-2710' Sandstone a8 1n core above, with clq shale" 22 Core ...........,... . . ]ìecoven: ~"Øth 2'710-2730° 109 08 Sandstonee fine to VGT'/' fine gra1nsdfl ell ty and arg111aceouso medium gr~$ s11ght¡Y micacðòusp sligh.tq calcareous in parto massi V80 A. 1 (J interval 3° above the base is ve17 silty and has argilla.ceous!) carbona.ceous laminae at top and bottomo Sandstone is compos!!Id of angular to 8ubangalars usually frosted grains of clear and white quaxtzl} with scattered dark rock f'ra&men teo A sample from 2720 6 bad 110 em t and onl7 a faint greaq stain as residue in CC140 Microfossils a.bsent" De-ptb Effective PoroBitl Air Fe2"JDeab1l1~ 27200 700~ im:parmeable 39 2730=2760° 2760=2770' 2'170-27808 278()...28108 2810=283>° 2820=2830 Q Core Sandstone, argillaceous. medium light grq. non-calcareouB<> Clay shale. with trace siltstone" Siltstone" with some clq shaloo Clq shale vi th good claavage9 '.!fi th aome sand.øtonso !teal t and peppe:¡;..It¡¡ s11 t19 slightly calcart9!)Û8o fine grained at tOPfI ver;¡ fins grained in. lover parto Sandstones ver:¡ fiDe gra1119do and. cl;q shale" SandstoneD fine to ver:¡ fine grainedo wi th small amount clq shale 0 40 a830-2850G 17B 611 ~J>t~ ReoovezY 2S50=æao B 2880-2900Q , 796" Cl8¥stone~ medium dark Ç'1qÐ slight17 to non= silty!> poor shaly to $11bconchoidal cle&vags-> Å 4$1 bad ,~f fine grained light {!l:83 eandstonlS 3u below top is vÐr.v calcareouso an4 contains ~e.ev1denta1iU!l shell fragments a.t the topa Å bed of v8ry fine grained calcareous ~ed1um light gr~ sandstone 7~ thicko with faint flat= qing laminaao is present 4ìØ below the topo Olaystone contains rara siltstons lenticleso gSSIl Sandstone 0 medium light f7ey~ var:¡ aUt, end argillaceoas, calcareouso wUh faint carbon... a.ceOU6p a.l"gillaceous laminae dipping 0-50 ~ in lower part" Fragments of medium dark gra3 cla;r ahaJ.'!!ì are abundant in *11 and 1" beds in the lower hsJ.f of the sandstoneo 7°5et Claystone as aÒOVSt with a. lOd 'bed of vary- fins grained sa.nd$tonœ &$ above bfhich has eo -tit bed of claystone in the center and a i" b~d a.t base" 06 31i Clays tona as a.bove" Microfauila absent" Sandstona. very fine grained. medium light Ç8¥~ a11 ty and argillaceous ) s11ghtlT calcareous!> w1 th small amount cl,q shale in lower part" Clq shale. very s11 t;r0 medium dark. ge::¡. grading to 811 tstOM, very a.rgillaceous. medium çrqo> with minoT amount sand.et01'l0ò æ . . 2900-2980 n Clqehale. very 811 V in parto wi tit minor amount sil tetone at 'base and tcpo and 80me bentonite at 290Q....2910Q 0 Clav shale grading to s11tst04eo Cla;y shaleo vi th minor amount aa.udstoneo Sandetoneo very fine grained!) ell ty and al"gillaceou8. non-calcar80uso wi th a emall amount of clq shale at the top 0 298()"~3000 9 3000-30109 3010-3028 0 Core -- De'Dth .JtecoveX'Y 41 3028-304811 14' 0" 2'61t Sands toMe fine to very fine grainedo medium light grEq'o argillaceoue and ei1vo n011- to var" ßllghtl1 calcareouBo with scattered small streaks òf medium dark gray 0181'0 086" Silt.tonEt.> medium grq!) very sanô¥. veq finely lam1nated., wi th i" bed of olq shale in upper part.. Grades in.to 1'0" Sandstone as above!! 'but with more numerous streak. (up to 3" long) of clq whioh 8UCpst sv1rlT beddlngo J. all bed of clq shale i ø present at the bottom of the sandstone.. 103011 Sandstone!) vary fine grained ) medium light gray~ Don-calcareou80 verr argillaceoue and s11 t1' p wi th some fine grained Ø8.I1.detonso a few th1n (1-211) secUons with fainto occaa1onally crollle~ 'bedc1sd laminae.. Thin beds <¡-2t1 thick), streakeo and intercalations of clay shale are preeent throughout and increa.se gradually in eise and abuwience w1 th deptho Small rounded bodies of sandstone (t~l" acros8~ and l/a.."¡1I tbick~ With the same compoßi tioD. a.s the rest ot the aud- ston81t are outlined 'by slightly- darker and sliptly more ezgilla.ceoue matrix" !rhq are present 1n groups or singly through the sand- stoneø with their long axee parallel the. bedding" M.icrofossils ve:í7 rare" C1Sl shaleo medium dark grqø becoming very silt7 with depth., Sands tOM , ver1' :tine grainadø arg111aeeo Uß and d1 ty Ð non- to slightly calcareous" 3048-3080 t 308Q...3Q90 í) ~ ~,jb 3092--3ll2Q ~cove~ 20Œ 0" Sandstone. very fine grainedo medium light gee;;¡ 0 Tar;¡ arg111aceoue and s11 t70 no!.1=> to slightl:- calcareouso i4ass'ivee oocasionally f'aint17 lam- inated" A 6" interval of interbedded medium dark grq clq ehala and. sands tone 0 with indi- v1d.ual beds 1 I a-tit th1ckD 18 present at 309"~ ~ 6" 'below this is a 5i1 'bed of medium dark gray non:"'ea1careou8 ;¡lightl¡- 811 V and micaceous Cl$1stoneo A 4" section of sandstone 18 above the base of the core con ta.fns a few thin in tsr= clÙa.Uons of cl8¥ ehalso ~СeTidental1um frag= mantis are common thròugb.Ou.t the core; pe1etOypod 43 24 COl'ê -= 3112-3130° 3120-3160' 3160-32108 3210-3280° 3280=3293' Core . D8~th :ReCOV'faJ . ß shells are also present. and a small fra¡ment of an ammoniteI' tentatlve17 identified as Cleonlceras. .po. pending further stuål'1> was found. at 3096 f 0 Miorofossils absento ;t)e-øt~ ~Jective Poros! ty .Air P,rmeabiliV 3109' 20 4(1,i impe1'lleable S11t8toll8e ver,- eauq. similar to S8A48~one ..boy., with SOl18 cl.,. shaleo Sauc1etoM. vert fine grai.uedo slight17 calca.reoU8Ð with I!IDal1 aIIOUDt claq lIhaleo SazLde'toDe a8 above but w:t. th more c~ 8balee whieh lnOreatle8 to 50ß vi 1;11 depth. Clq ahalet medium dark g.'"qo slightly 811tyc with minor amount 811t- stone. medium light gra;yfJ ellght~ sanã;r. very slight17 calcareouso at topo C1., Bhale and øandetone. V,'Iry fine grained. medium 11&ht 1;87. ve17 811 V and argillaeeousc øll&ht17 calcareousø wi th minor amount bentonite. pale blue-green. Itlightly argillaceous and 811t7o 43 ])e])\11 3293-3313' 282" 3313=3320U 3320=3330 G 3330-3350 ~ 3350...3358° Core -= Becovea: 3)0 011 lCllft ¡9a" 288" 6$98 . ops" 1J5" 31111 S13. t81ioMø med.! Uit1 grq ~ V8-q 8~1' e11ptl;y ca.1.ca.reou.s. vi th abundant intercalations of altw.tone totaling about ;f of the mako Siltstone as above. but faintly laminated and la~t1»g cl~ intercalat1onso Siltstone as at tope! corso 5il tstODeo msdiv.m light grqe slicht17 caJ.ci.\1'eoue~ w1 th carbonaceouso micaceous lø1:ðae which give good 15hal1 cleavage to the rocko 611 'ts\;one wi th clq intercalations as at top of eO%'60 Clay tJhalse medium dark grqo slight17 sili;Jo poor shal1 cleavagso Siltetontto medium grB¥r, verT aanq and arg1l~~ laceou.se calcareouso ma.ee1 Teo Siltstone as at top of corso Microfossils vsr,r rarso 5il tetons wi th clay ab.t.le and smell amount sandstonso No eøple Clay shale" graci1J3g to siltstone. withver; &mall amount fine grained e&l'Adeto.ue at basso Sa.D.detone. fine to ve¡y tine gra.ined~ medium li&ht grqo siltT and arg1llaceous0 elightly calcareouso micacsou80 De"Dth Jiecove~ 2U,a" Sand-stoneD fiDe gained, medium light lfl:A7o slightly calc9Zeous a.t top grading to ver;¡ calcereous at basso Scattered intercalations of earbf)n&ceo'\.\8 and arg1l1aoeou.s ~t6rial are 44 3358=3378' 20fJ OC 3D . . R~v~ .q,pJilt ~n preSÐJlt and. suggest dip of 0_50 0'4" Cla.YBtone~ medium dark grq, nots11W.. very a11ght1¡ ca.lae.I'&Ou.8 in part. irregular frac- ture. 196ft Clayetonét med1wn I!7Ø1'. not a11t1..èonchoidal f:rac~e, non-c6Ùcareous. 2'1 II Cla¡rstone.. _dia dark grl¥~ eJ.i¡ht}J' cal.- careous.. slightly oil V. 12' 3fi Sandetonet fine gra1nede grad1n& to .Vffq' tine grained at base, medium ligh\ 1Jr93f! 811ty and argillaceous" slightly calcareous to ca1- ca.reoUEh slightly micaceous, massive. Bounded shale pebbles 1# in diameter are present in a 2ft interval at 3362', with a few tm1all (under 1ft) intercalations and pébbles ~t cl81 ehala 8. t 3369-3310 B and 33?6-33?'6 B .. ¡ilHectivGi Air Cl!\I'bonate Content ~;~~; ~~~~ !'=:=;:~~ ~ ~::t1:t ... . . 3373' 4000 n 28..5 1 ~ 8" Sil t6tO:ieo vø¡y sa.u~ and argilJ.&CeOU6f; œediwn dark gra;:¡ f very slightly calcareoufh . with abundant carbonaC0QUB and biotiteparticleso Microfossils absent" CleJV ßbale~ medium dEæk gr&,y~ fU.ltYe and siltstont1p. medium. gf'8$.gi'ad.1ng to. aa.nd..tOtLEh VðI7 fine gained. medic light grql> ß11ghtly calcareous to Caløar&CUB. which ,øcreaees with deptho 0181 ehala with 80me $iltstoneo Cle,y!Shele. medium dark gz'8Ye elightl1 to non"ë>sil tYI> slightly calcareous between 3450-346040 Clq ehalge wi ih minor ~OU.l"lts medium çay very argillaceous siltstone and tl'a.eesand.stcu'1&o No sample.. 3378=3400" 3400.=34101 341Q...-341O R 34'10=34..00 0 3490<~3494' !@cove~ l!e.p,J]} 3494=3614° .9.~~ Sandstone. veX'¡ fine çained. medium light: ç~ c eil t;¡¡ and &rgi11acsous~ calcareous.. Grou.pe of :rounded cl~~ shale pebbles are present l' aDd 23 Dslow top of 001'$0 Pebbl~'H~ :r~aoe from sm.e¡l flakes to 2" in diameter 0 Cl~sto.nee medium dark (Çff3,. ailtye "Ve'17 illightlT calce.:rGOUSe irregu1&r fracture. Rare thin (~lU thick) cro,sbadded bade of siltetoîll!! are prsaen:to SiltltO!\0e i:E>EAing to VfiJ7:Y fin€ gra.ined very silty and a.,rgillaosoue sandstoJ1e at ba.se; medium light fCE"'83F slightly calcs.reou8, with faint lsminaa giving fair e~y cle~vageo Cl~ston!) a~ ~:oove. ;;~L'Y øil ty. SlIDdst.on$, Vq;¡¡1'¥ :f'ine. ~'aiJ2(;do a¡·gilJ.~eacu5 a.nd E:il f¿.ih ~.c~@{)~@p YilM¡¡6iv¡ih "í.u:d.fo/.~o N~&rl;r aG7· 1'"/; 61i 45 3~3tf 09ß~ :30 3t; €' 3f~ ~. q, ~..¿ . . ~ ;De-pQ BeCO'Ve17 vertical (88-89°) t.ractures, with patche8 of ,ara¡onite aoatixa.g. split the sandstone core lonp tud1ual17 tor most of 1 tl length.. Et:tective Air Carbonate Conteut De'Dth Poro a1 V perrøeabili V ~, b1 Wei«ht 3509° 5.51r impeøeab1eZ1..f'þ lIierete..tl. verT rare. 46 361"~32' '8' 0" 684* SaDcl.tone. Tery fine grained. sUv auel arg1l- 1a080118. medium ligbt tt.rq. e1 ight17 calCàX'- eoua, _..1'9'8. If:f'ective Air CarboDate Content .De'Dth Poroø1 ty b~eab11U;1 i 'b¡~t 3520 6· 6.8_ impermeable· 160 l&S" Clq8tone. medium grIfT" verT B11Q' ) calcareouBo Microfossils absent. Clq shale. medium dark grq. non-calcareous~ with small amount 88Ddstons. San4stone. ve'q tine grained. medium light gr8¥. calcar.ouss with very small _ount clq shale. Clay shale aJ1d 8aAdetoneo Sandstone vi th 80me. clq shale and trace pale yellowish white beJitol1:Ueo , C1q shale wi th emall øoun t B8hds tone and minor allOw¡ t 811 teton..; 0181' ebale. medium darlc grq. 811~tly to non-sUtT. with common streaks siltstone. v817 argillaceous, medium grq to medium dark Uqe 8l1ghtl7 ,calcar.aua to calcareous. Cla.v shale. medium da:rk grqø very slightly ell ty~ nòn-calcareous. wJ"th rare thin streak. Ter ' argillaceous 1311 tetone" 3532=3540 u 3540=3550 ~ 3550=3560 0 3560-3570 0 3570=3580 0 3660-3680 ' 3680=3'140 · 90re DllfPl~ Becove~ 47 3740-3760' 12' aft Clqstonec medium dark grs;¡o very slightly micaceous and silt3e non-calcareous. with irreg¡.ú.a:r cleavage.. Cl.qstone between 37428 and. 3747' i 8 badl7 broken and 1nfl1 trated wi th . drilling .wi; ~ of the fragDientø bave slickensided surfacee" A. f'lat1:'1ng éllt lamina tIS thick is present a1; 3755° 0 Pelec1Pod. shell impressions are scattered throughout" Zone :BC microfossils are rare.. To .14' 3760° ~~ Florence Rucker December 11e 1952 a7 :,~·h.~ ".__:.....~ "Old" Na\.")" \';ells (1944-S3) Well Name J Avak -, 100-Oé}'?- South Barrow-l /00 -083 South Barrow-2 /00 -oóJ'-! Sôuth . Barrow-3 laD ~O~ ! South Barrow-4 I 00 r oó) (, í F±sh Creek-lIDO -;ðÒ i GJrandstand-1 100 -<þS""3 . I Gubik-l lOb -¿;)"t). I [ I Gubik-2 IDO-:;):;)~ . Kao1ak-1 /00 -9~ Knifeblade-l J{JO - /Ì)./ Kn.i:feblade-2 / Of:> - ~~ Knifeb1ade-2A ¡:s. "or J(",¡Pe.JølQ.òe 6- l1eaåe-l Ou.-nalik-l IOD-/I<! j Eas.t OUIna1ik-l 1DOrIl\S- SÌJnDson-1 /DÒ-/(P3, Nð;/h S,'"1p::ÞI1-1 }()()..,OI1[ Squ~re Lake-l J 00 -I{<" Titð.1uk-l IOQ-IQö . Topago'ruk-l JoO -,~t Ea~t Topagoruk-l I. ~6- Umiat-l /00 -QúD¡ , I Umiat-2 loO-QIO I Umiat-3 (oo-911 Umiat-4 /00 '91;). , Umiat-S I DO -fH3 ¡ --j Umiat-6 100 -;).14! Umiat-1 If/Ó -é)/~j I Umiat-B I {)() -d 1 (P j Umiat-9 Jó ö -Q/9¡ Umiat-10 t{)()....é)I1f Umiat-l.l IDO ....t)/1 I, Wolf Creek-l IbO-~I~ i Wolf Creek-2 IUD-;\! t'õ í Wolf Creek-3 / (i) -# I~ .. I ., t 1 f . í J -..--.-.,".-..-.. -.....--. --",;._.._."_._._.~ ....--.... .-. --'---,..-.-"-'-- -_.._----.~_...__..... ._---~_. "Intermediate" Wells at Barrow. (1955-1914) , . South Barrow-5 It>ö-b~15 South Barrow-6 iOO-ö;;)c; .~ South Barrow-1 16b'-o'3D South Barrow-8 /061-031 South Barrow-9 I()D....(:;ß;J. South Barrow-10 1d.:>-033 South Barrow-l1 IfP -ó'3~ I f ! South Barrow-12 /óO-òW-- ~ . iI ^It{'
